Mount & Blade Collection is the bundle of every Mount & Blade games which was created by TaleWorlds.
In Mount & Blade we take control over traveler who came to Caladria. Its terrains are controlled by a many kingdoms. It causes bigger or smaller armed conflicts. Game doesn't offer a campaign. Instead of that it offers a complete freedom to shape the fate of the main character.
Mount & Blade: Warband is the independent addtion where many of aspects were expanded and improved. Game offers expanded multiplayer mode.
Mount & Blade: With Fire & Sword is the expanded version of Mount & Blade: Ogniem i Mieczem. There are a lot of improvements and first of all multiplayer mode.