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The "medium" is the substance or material that carries a mechanical wave.

Waves in the ocean are mostly generated by the wind moving across the ocean surface.

Many waves cannot be seen such as microwaves and radio waves.

One of the most important things to remember about waves is that they transport energy, not matter. This makes them different from other phenomenon in physics.

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Without waves alot of our technology can't be here for our personal use right now like:
Radio waves

TV and FM radio

Direct line of sight with transmitter

Satellite signals

Frequency of microwaves pass easily through atmosphere and clouds

Infrared radiation

It is used for night vision and security cameras as Infrared Radiation is visible in daytime or night-time

Police use it to catch criminals, army use it to detect enemy

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Waves are everywhere. Most of the information that we receive comes to us in the form of waves. You rely on waves to bring you music and TV. You can cook with waves, talk to others and see things all because of waves. Waves transfer energy in different forms, some are very useful, while others can be deadly.

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A crest is a point on the wave where the displacement of the medium is at a maximum. A point on the wave is a trough if the displacement of the medium at that point is at a minimum.

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https://padlet.com/bubba051904/8a2615azezoh

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https://padlet.com/bubba051904/b6m0nuuvfxd5

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There are many wave interactions like refraction, diffraction, reflection and absorption.
Refraction: The process of a wave bending as it crosses a boundary between 2 materials.
Diffraction:The process of a wave bending through a corner or passing through an opening
Reflection: The process of a wave bouncing of an object
Absorption: What happens when an amplitude of a wave gets smaller and smaller as it passes through an object.

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Some types of waves are circular and plane waves.
Circular Waves: Moving waves that have crests that form circles around a single point where the wave first began.
Plane waves:  Moving waves that have crests in parallel lines.

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In one complete cycle, a wave will move one full wavelength. To calculate the speed of a wave, you can multiply the frequency by the wavelength. You can also get the distance traveled and divide it by the time.

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Cycles are a unit of motion  that repeat
Period: The time it takes for each complete cycle.
Oscillator: A physical system that has repeating cycles. Systems that oscillates moves back and forth.
Harmonic motion: Motion that repeats its cycles.

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Another thing that every wave has is frequency. Frequency is the number of complete cycles per second. The time it takes for 1 cycle to occur is called period. The unit of one second is called hertz. Something that completes one full cycle is equal to 10Hz.
Natural Frequency: The frequency at which a system oscillates when disturbed.
Periodic force: A repetitive force

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The amount that a cycle moves through equilibrium is called amplitude. All waves have amplitude. An amplitude is most of the time a distance or an angle. The way to measure amplitude is by the maximum distance the oscillator moves away from its equilibrium position
Resonance: An exceptionally large amplitude that develops when a periodic force is applied at the natural frequency

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A wave is an oscillation that travels from 1 place to another.  Wave motion is due to the spreading of the wave from where it begins.
Wavelength: The distance at any point on a wave to the same point on the next cycle of the wave.
https://youtu.be/wWwq8r3-UqU