Which redirection operator appends STDOUT output to the given file name adding it to the end of any existing file contents?

The redirection operator that appends STDOUT output to a given file is >>. When used, it directs the output of a command to the specified file, adding the new content to the end of any existing contents without overwriting the file. For example, using echo "Hello" >> file.txt will append "Hello" to the end of file.txt.