What is the main visual difference between a colon and a semicolon?

A colon consists of two dots, one above the other, while a semicolon is a dot floating above a comma.

According to the video, what are the two primary functions of a colon?

To explain something in more detail or to identify a set of things explicitly.

Linking two independent clauses that show contrast.

A semicolon gives a sense that two statements are related, whereas a full stop makes the connection more blunt and linear.

I can combine two related independent clauses using a conjunction, semicolon, or colon to form a compound sentence.

1
A colon is used to explain something in more detail or to identify a set of things explicitly, while a semicolon links together two related sentences.
2
Semicolons can be replaced with a full stop, but semicolons give a sense that two statements are related.
3
Colons are logical and unpack things, but semicolons are closer to life, connecting but not entirely explaining related ideas.