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this is not a storage device

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A USB is a standard cable connection for personal computers and other electronic devices.

Source:
A USB port is one of the most useful features on computers and phones. (n.d.). Retrieved August 11, 2016, from http://compnetworking.about.com/od/usbnetworking/p/usb-port.htm

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This refers to any device that can represent information from a computer.

Source:
What is Output Device? Webopedia Definition

http://www.webopedia.com/TERM/O/output_device.html

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INPUT DEVICE
Digital cameras can also be input devices because they capture images electronically. And you can edit the images in a computer within a program.

References:
Cárdenas, D. (2016). Logical Thinking (2nd ed.).

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RAM (a type of memory) is considered a volatile memory, which means that stored information is lost when there is no power

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Difference between input and output device is the following, input devices sends information to a computer system for processing and the output displays the results.

Source:
What is the difference between an input and output device? (n.d.). Retrieved August 11, 2016, from http://www.computerhope.com/issues/ch001355.htm

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An input device is a must have since you need it to connect and send signals of what you want to your device.

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STORAGE DEVICE
These devices are important because if the information or data isn't saved in one of this it will be  deleted.  Also there are three types of storage devices: Magnetic, Optical and Solid State.

References:
Cárdenas, D. (2016). Logical Thinking (2nd ed.).

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Output devices can be confused with storage devices which can also receive information from a computer. USB's , DVD's and flash drives are not output devices.

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MEMORY
There are many types of memory, some of them are the following: RAM (Random Access Memory), ROM (Read-Only Memory) and CMOS memory (Complementary Metal Oxide Semiconductor). Their main use is to store data or programs that are being used.

References:
Cárdenas, D. (2016). Logical Thinking (2nd ed.).

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These picture is an example of how a memory device looks.

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CDs, USBs, Hard Drives, SDs, all are examples of storage devices.

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Computer memory is any physical device capable of storing information temporarily like RAM (random access memory), or permanently, like ROM (read-only memory). Memory devices utilize integrated circuits and are used by operating systems, software, and hardware.

What does computer memory look like?

Below is an example picture of a 512 MB DIMM computer memory module. This memory module connects to the memory slot on a computer motherboard.

Volatile vs. non-volatile memory

Memory can be either volatile and non-volatile memory. Volatile memory is a memory that loses its contents when the computer or hardware device loses power. Computer RAM is an example of a volatile memory and is why if your computer freezes or reboots when working on a program, you lose anything that hasn't been saved. Non-volatile memory, sometimes abbreviated as NVRAM, is a memory that keeps its contents even if the power is lost. EPROM is an example of a non-volatile memory.

What happens to memory when the computer is turned off?

As mentioned above, because RAM is a volatile memory, when the computer loses power anything stored in RAM is lost. For example, as you are working on creating a document it is stored in RAM if it is not saved to a non-volatile memory (e.g., the hard drive) it would be lost if the computer lost power.

Memory is not disk storage

It is very common for new computer users to be confused by what parts in the computer are memory. Although both the hard drive and RAM are memory, it is more appropriate to refer to RAM as "memory" or " primary memory" and a hard drive as " storage" or " secondary storage."

When someone asks how much memory is in your computer, it is often between 1 GB and 16 GB of RAM and several hundred gigabytes of even a terabyte of hard disk drive storage. In other words, you always have more hard drive space than RAM.

How is memory used?

When a program such as your Internet browser is open, it is loaded from your hard drive and placed into RAM, which allows that program to communicate with the processor at higher speeds. Anything you save to your computer, such as a picture or video, is sent to your hard drive for storage.

Why is memory important or needed for a computer?

Each device in a computer operates at different speeds and computer memory gives your computer a place to quickly access data. If the CPU had to wait for a secondary storage device, like a hard disk drive, a computer would be much slower.

Types of RAM

Some of the more common types of memory chips for computers are listed below.

These types of memory all fall into the general categories of SIMM or DIMM.

Computer acronyms, GDDR, Memory capacity, Memory terms, Primary storage, Processing device, RAM, ReadyBoost, TSR, Virtual memory, Volatile memory

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Computer memory is any physical device capable of storing information temporarily like RAM (random access memory), or permanently, like ROM (read-only memory). Memory devices utilize integrated circuits and are used by operating systems, software, and hardware. Below is an example picture of a 512 MB DIMM computer memory module.

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What is an Output Device?

An output device is the one that shows information to the user in form of text, graphic, video or even audio. These can be shown digitally or printed if it's possible. Their main use is to send information from a computer to another device or to a user; to show results. Some examples of output devices are printers, monitors and speakers.

References:
Cárdenas, D. (2016). Logical Thinking (2nd ed.).

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What is an Input Device?
Input device, is any hardware that sends data to the computer, letting you interact and control the computer. For instance, two common input devices on a computer are the keyboard and mouse.

Source:
Input device. (n.d.). Retrieved August 10, 2016, from http://www.computerhope.com/jargon/i/inputdev.htm

Natalia Patiño - The mouse is an example of an input device

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Memory is any device or internal storage in a computer that keeps information either for a long or short time. For example, the primary most used type of memory is the volatile one in which any random access memory is lost when turning down your computer.

Source:
What is memory?

http://www.computerhope.com/jargon/m/memory.htm

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What is a Storage Device?
A storage device is any computing hardware that is used for storing, porting and extracting data files and objects. It can hold and store information both temporarily and permanently, and can be internal or external to a computer, server or any similar computing device.

Source:
What is a Storage Device? - Definition from Techopedia. (n.d.). Retrieved August 10, 2016, from https://www.techopedia.com/definition/1119/storage-device