What do you mean by metacharacters?

In a data program, metacharacters are particular characters that give information about other characters. In shells, they are called regular expressions. A character, not a letter or a number, is usually considered a metacharacter. Using shell metacharacters, you can group commands, redirect and pipe input/output, put commands in the background, reduce the size of file names, etc.

BY Best Interview Question ON 30 Dec 2022