A string is traditionally a sequence of characters that can exist in a variable or can just be plain raw. Strings are usually between two quotation marks (") or apostrophes ('). A backslash followed by the letter n ("\n") will jump to a new line, while a backslash followed by the letter t ("\t") will insert a tab space at the location.
Here is an example of a string in a Lua format:
a = "a string" --Notice how the message/string is between the quotation marks b = 'another string' c = [[This is Multiple Lines! And it works!!!]]