Bursitis is when you have inflammation of the Bursa which is a Sac like Cavity that surrounds our joints which are filled with fluid to reduce friction caused when our joints move.
Our Hips, Big Toes, Shoulders and elbows are the most common places where Bursitis occurs.
Arthritis on the other hand is Joint Inflammation which happens because of degeneration of our connective tissues and our bones.