If you are served with divorce papers, this means you receive a summons and a Petition for Dissolution of Marriage. The petition lists why your spouse wants a divorce and what they want from the divorce. The summons tells you where and when to file an Appearance and an Answer to the divorce petition.
Usually, you have 30 days from when you were served the divorce papers to file an Appearance and an Answer. If you ignore the divorce papers, you won't go to jail or pay a fine. However, you will lose by default because the case will go on without you. This means that your spouse will what they asked for.
The judge will base the case decisions on what your spouse wants, without hearing your side. If you want your side to be heard, you should file Appearance and Answer forms and go to every court date.