It goes without saying first and foremost you’ll need a sturdy tent or shelter to protect you from the elements.  A suitable sleeping bag; take into consideration the climate when purchasing to ensure you’re not going to be too hot or cold.  Enough food for the entirety of your trip, and water, or a water purification system. This may not be as important if you’re staying somewhere close to local amenities.  Appropriate breathable and comfortable clothing that you can layer during cooler months or evenings.  This one’s self explanatory, a well stocked first aid kit.  A torch to help guide you back to your tent in the evening or help you navigate your route to the camp toilets.  If you’re camping in the summer months don’t forget your sun protection especially if you’re camping with kids.