Experience Points

Introduction
Experience points (also exp, rep or XP) are the primary reward for undertaking adventures in Borderlands. Every player starts with 0 experience points and level 1. Completing quests, achievements and killing hostile creatures results in an experience reward that cannot be lost.

Once the experience is gained your character will increase his/her level upon reaching a certain threshold. The maximum level cap for all character is currently 50, but the experience points are still awarded.

Level improvements
For each level gained your character will receive 15 extra health points added to the 100 base, which means the health calculation is: 100 + (level-1)*15. Also, every level aquired rewards your character with 1 skill point starting at level 5 meaning a total of 46 skill points at level 50. Other characteristics like melee damage or resistance also increase at higher levels.