Table
Many campgrounds will have a picnic table of some sort, but they are often super dirty and sometimes they aren't included at all. Now, if you are in an RV there is a good chance you have some tables inside, but if you are tent camping, tables are something that become very useful.
Of course you may want somewhere to eat, but you also may want to put some things down while you cook, prepare to go fishing, plan your hike, play a game, even a place to put your beer...
There are a few things to take into account, size, weight, and ease of storage.
Size sounds pretty self explanatory. If you need a table for a family of four you probably want something that you can all sit at. Something that could fold up and store away that is 2 by 4 feet would be pretty acceptable. If you are hosting a huge camping event then you may want a few tables that are all in the larger category.
Of course they can vary in weight quite a bit. There are canvas ones that are lighter, but they are not as firm and I wouldn't suggest it unless you don't want to put anything on it that couldn't fall on the ground. But the biggest thing to realize is how well they compact. Some tables fold in half and lay flat while other break into multiple pieces to be stored in different ways. Knowing your cargo capacity and how you can fit things into your space is important for car camping.