Why do some of the examplsle codes written in ' ' form but also in " "

Question

Semi colon

Answer 1

Depends on the language. Mostly it does not matter. In php the variables are recognized in " " but in ' ' not.

Answer 2

Because it's sometimes necessary. For example you will face problem if you only use "" for setting an attribute in html.

//Error and not functional:
button.onclick = "function("red")";

//Fixed code and functional:
button.onclick = "function('red')";

Answer 3

Thank you soo much

Answer 4

Usually ' ' are used for single characters (letters), and " " are used for strings.
Im most languages it doesn't really matter, but it depends