When does we use " ' symbols

Question

doubt

Answer 1

You use them to mark strings... Both of them are equivalent, but if you mark the string with one of them, you don't need to escape the other with a backslash:
'What is "Python"?'
"What is \"Python\"?"
These strings are identical.

Answer 2

mass answer thank you...

Answer 3

in short .....mostly u double quotes because it supports other programing languages code