CD (i.e. Change Directory) command in linux is used to change the current directory. The current directory is where the user is working in directory currently and If you working in linux with any command then you are working under some specific directory.
cd command is built-in shell which will use to change the directory level . The syntax for the cd command are as per below :-
$ cd [OPTIONS] directory
Example : The below example will navigate to specific directory by using the absolute path :-
$ cd /home/username/Downloads