Pest control is the maintenance of bugs and pests. It involves getting rid of pests when they've invaded and are causing problems, as well as taking preventative measures against pest invasions.
Nobody wants to live in an apartment that's infested with ants, cockroaches, rats or anything else with multiple legs. Not only are they annoying, but they can carry harmful diseases and cause damage to our apartments.
Although it will cost you a little bit of extra money in the beginning, maintaining a pest-free apartment will save you a lot of money in the end.
The most important thing you should do is let your landlord know about the problem. Even if they aren't responsible for taking care of it, it's their property and if the problem worsens without them knowing about it, you could end up paying for major damages later on.