What is a motion for summary judgment in court of common pleas?

I received a copy of a letter sent to clerk of court in my hometown asking for a motion hearing concerning an old credit card debt for $2093.74. I am worried sick about this. I am 78 years old, on disability. I own my home but it's listed as a Homestead exemption. What's going to happen to me? What would happen if I didn't show up? I can't afford a lawyer. Please help!!!