What's the use of meta charset and its properties.

Question

Meta issue
https://code.sololearn.com/WiKWDQpxJBvQ/?ref=app

Answer 1

<meta> is a HTML tag that contains metadata about a web page, or more specifically, descriptors that tell search engines what type of content a web page contains that is hidden from display.
charset is an HTML attribute that defines the character encoding for your browser to use when displaying the website content.
utf-8 is a specific character encoding.

Answer 2

<meta name="viewport" content="width=320, initial-scale=1">
What's the point of this line