What does the '&&' operator do in a conditional command sequence?

The && operator in a conditional command sequence is a logical AND operator. It allows you to execute the command that follows it only if the command before it succeeds (i.e., returns an exit status of 0).

For example:

command1 && command2

In this case, command2 will only run if command1 completes successfully. If command1 fails (returns a non-zero exit status), command2 will not be executed.