colour depth;

Colour depth describes the number of bits per pixel (bpp) that can be displayed on a computer. Each bit represents two colours, because it has a value of 0 or 1. The higher the colour depth, the more wider the range of distinct colours (more bpp = more colours displayed).

Since the colour depth describes the range of colours in an image, it would affect how the image would appear. An image with a high colour depth would, obvious, have a wider variety of colours and shades, which could give the image more depth. As opposed to an image with a low colour depth, with less colours and shades, which would make the image appear blunt and dull.

The following is a range of colour depth of the same image:

1 bit

2 bits

4 bits

8 bits

24 bits

colour depth vs sampling rate;

The colour depth affects the quality of a still media - whether they are images or video frames and the sampling rate affects sound. Videos have both have visuals and audio, which means that it can be affected according to both colour depth and sampling rate.Still media, on the other hand, are purely visual (with no audio) so it won't be affected by the sampling rate.

sampling rate;

Sampling is the reduction from continuous signals to discrete signals. In digital audio (videos), the sampling rate is the number of times per second that a sound wave is measured. It affects the quality and reproduction of the sound so the higher the sampling rate, the more accurate the sound is.
The following is a comparison between a lower sampling rate (8 samples) and a higher sampling rate (16 samples):

bit & byte;

bit;
A bit is also known as a binary digit. A bit is the unit of measurement used for information storage in computers. It only has one single binary value, which can be either 0 or 1 ('true' or 'false'). The computer converts all data into bits and bytes through alphanumeric and decimal to binary conversion. This means that alphabets and letters are all represented into bits.
There are 8 bits in a byte.

byte;
It is also a unit of measurement used to describe the storage capacity (size of file) and transfer rate of digital media.
The following are size conversions from bytes:
1 kb - 1 024 bytes
1 mb - 1 048 576 bytes
1 gb - 1 073 741 824 bytes

number system;

Digital data is based on the binary numeral system, or base-2 number system. This system represents numeric values using two symbols (numbers): 0 and 1. (see bit & byte)

forms of digital media;

The following are examples of digital media:
• mobile phones (cellular phones)
• compact discs
• digital video
• televisions
• e-books
• internet
• video games
• game consoles
• computers
• interactive media