Exocyclic doubel bond by definition is a double bond where one of the participating carbon atoms is a part of a ring, while the other carbon atom is not part of the same ring. From the name we can understand that exo-cyclic would stand for a double bond outside the ring and endo-cyclic would stand for a double bond within the ring.
For each exocyclic double bond, we must add +5 nm to obtain the λmax. Below are a few examples as to what are exocyclic and what are endocyclic double bonds.