The file extension is the last part of a file name.
What format the file has.
For example: pdf
The format determines:
What is the internal structure of a file?
For example, for videos:.mp4, mpg or .mov
A follower is a person who subscribes to another account on a social media platform.
Fake news is news that is untrue.
This is how the text should look (font, letter size, bold, italic and more).
Functions are predefined formulas in a spreadsheet programme.
They are used to calculate something.
A formula calculates something in a spreadsheet programme.