>>113271212Usually during an episode one of two things happen.
A). Tom is tasked with by his owners to make himself useful and get rid of Jerry so he can stay in his home. While sometimes not brought up in some episodes it is assumed he's chasing Jerry for this reason.
B).Jerry continuously shits on Tom at any chance he can get so Tom's obviously going to get him back for being a little shit.
Everything else is in between the two except the movies in which Tom and Jerry work together.