Is the auxillary belt the same as the timing belt?

I have a Nissan Micra SI 1998

When I took my car in for its annual service I was told that the auxillary belt was starting to perish and would need doing.

I had this done and found out that there are in fact 2 belts. Which were both replaced.

What I would like to know is whether the auxillary belt is the same as the timing belt or is this a different part that will also need to be replaced?


Thanks