An operating system for smartphones and tablets from the Google-sponsored Open Handset Alliance. With myriad models to choose from, Android is the leading mobile platform with approximately 75% of the worldwide smartphone market. More devices with the Android are currently in operation than any other OS.
Reference: https://www.pcmag.com/encyclopedia/term/android 

The Android operating system is a mobile operating system that was developed by Google (GOOGL) to be primarily used for touchscreen devices, cell phones, and tablets. Its design lets users manipulate the mobile devices intuitively, with finger movements that mirror common motions, such as pinching, swiping, and tapping. Google also employs Android software in televisions, cars, and wristwatches—each of which is fitted with a unique user interface.
Reference: https://www.investopedia.com/terms/a/android-operating-system.asp 

An application, also referred to as an application program or application software, is a computer software package that performs a specific function directly for an end user or, in some cases, for another application. An application can be self-contained or a group of programs. The program is a set of operations that runs the application for the user.
Reference: https://www.techtarget.com/searchsoftwarequality/definition/application?amp=1
B

Browser is a software application used to locate, retrieve, and display content on the World Wide Web, including webpages, images, videos, and other files. As a client/server model, the browser is the client run on a computer or mobile device that contacts the Web server and requests information. The web server sends the information back to the browser, which then displays the results on the Internet-enabled device. Examples are Google Chrome, Mozilla Firefox, Safari, Internet Explorer, etc.
Reference: https://www.webopedia.com/definitions/browser/amp/
C

 Cascading Style Sheets is a computer language for laying out and structuring web pages (HTML or XML). This language contains coding elements and is composed of these “cascading style sheets” which are equally called CSS files
Reference: https://www.atinternet.com/en/glossary/css/ 

CD-ROM, is an abbreviation of compact disc read-only memory, type of computer memory in the form of a compact disc that is read by optical means. A CD-ROM drive uses a low-power laser beam to read digitized (binary) data that has been encoded in the form of tiny pits on an optical disk. The drive then feeds the data to a computer for processing.
Reference: https://www.britannica.com/technology/CD-ROM 

Computer is a device that stores and processes information according to a set of instructions. In other words, a computer is a device that you feed information into and it does something with the information (processes it) based on some instructions (a ‘program’) that it has been given.
Reference: https://www.igcseict.info/theory/0/comp/index.html
E

eLearning, also referred to as online learning or electronic learning, is the acquisition of knowledge which takes place through electronic technologies and media.
Reference: https://e-student.org/what-is-e-learning/
H

HTML stands for “hypertext mark-up language”, and is the language that is used to tell the web browser (e.g. Internet Explorer or Firefox) what to display.
Reference: https://www.advanced-ict.info/html/basics.html 

Hardware is any part of a computer system that you can physically touch. Hardware includes both the internal components inside a computer, as well as the external peripherals outside of a computer.
Reference: https://learnlearn.uk/igcseict/what-is-hardware/ 

LAN is the abbreviation for Local Area Network. A Network of computers at one site that provides services to other computers connected to it. A LAN is usually limited to an immediate area, for example the floor of a building, a single building or a campus.
Reference: https://sites.google.com/site/revelynresolo/routers 

Network is two or more computers, or other electronic devices, connected together so that they can exchange data. For example a network allows computers to share files, users to message each other, a whole room of computers to share a single printer, etc.
Reference: https://www.igcseict.info/theory/4/netw/index.html 

The use of the Internet to follow a course that usually results in the award of a diploma or certificate. It is often closely associated with E—learning.
Reference: https://sites.google.com/site/revelynresolo/routers
P

Podcast is a type of digital media, usually audio, that is available in a series of episodes or parts and is streamed or downloaded by the end user over the Internet. Podcasts can be made available via a release schedule or uploaded to the Web randomly
Reference: https://www.techopedia.com/definition/5546/podcast 

A proxy, also known as a “proxy server” or “application-level gateway”, is a computer that acts as a gateway between a local network (for example, all the computers at one company or in one building) and a larger-scale network such as the internet.
Reference: https://kb.iu.edu/d/ahoo
Q

QR is short for Quick Response and is a two dimensional bar code which can be read quickly by a cell phone or tablet device with a camera and QR reader application. They can be printed on paper or displayed on a screen and are used to encode small amounts of information such as a website URL, GPS location, product information or other useful short text.
Reference: https://www.waikato.ac.nz/ict-self-help/glossary.
R

An acronym for Random Access Memory, referring to the dynamic memory in the silicon chips in a computer. RAM chips are the memory chips used as the temporary working area for  and developing programs.
Reference: https://sites.google.com/site/revelynresolo/routers
S

Software is a generic term used to refer to applications, scripts and programs that run on a device. It can be thought of as the variable part of a computer, while hardware is the invariable part.
Reference: https://www.techtarget.com/searchapparchitecture/definition/software?amp=1
V

Virtual classroom is a digital learning environment that allows teachers and students to connect in online in real time. Virtual classrooms utilize video conferencing, online whiteboards and screen sharing to allow educators to hold live lectures, virtual office hours, and discussions with students in an interactive setting.
Reference: https://tophat.com/glossary/v/virtual-classroom/ 

Virtual private network, or VPN, is an encrypted connection over the Internet from a device to a network. The encrypted connection helps ensure that sensitive data is safely transmitted
Reference: https://www.cisco.com/c/en/us/products/security/vpn-endpoint-security-clients/what-is-vpn.html