What is the theme in Endgame by Samuel Beckett?

One of the most obvious themes of Endgame is the necessity of interdependence, even if the relationship is one of hate. Clov, for example, depends on Hamm for food since Hamm is the only one who knows the combination to the cupboard. Hamm relies completely on Clov for movement and vision. Critics often compare Endgame to Beckett's previous drama Waiting for Godot, noting that characters in both plays are grouped in pairs. Endgame is bleaker and more perplexing because it lacks the hope for redemption that Waiting for Godot contains.