Moksha, or Liberation, is the ultimate goal of every individual. Moksha is the experience of, and realization that the individual self is the same as the Universal Supreme Self. It is an expansion of individual consciousness into the Universal consciousness. Liberation is not something attained after one's life, rather it is a permanent merger with one's True Divine Nature.
Every individual soul has their own unique path of evolution. This is a path that one chooses to gain the necessary experiences and to repay the karmic debts. One's birth ends with the death of the body, but the soul has accumulated karmas. The soul takes birth as a different personality and starts with the karmic balance that was accumulated. And instead of bringing the karmic balance to zero, more actions are performed, increasing one's ties to the material world.
Moksha is being liberated from all bondages. Moksha is about transcending this seemingly endless cycle of birth and death. It is about preventing a soul from taking birth on this earth within this perpetual cycle. If one is bound, how can they be free? One can be bound either by a golden chain (good karmas) or a rusting chain (bad karmas). Either way one is still bound.
However, it is possible to attain Moksha in one's lifetime by accelerating the process of the evolution of the soul. The seers and sages in many traditions have shown paths for people to follow so that they can evolve themselves into perfected souls, in this lifetime. They have articulated frameworks which give broad guidelines to people for walking the path to Moksha. These frameworks not only contain the teachings and insights that are necessary, but also lay down specific practices and methodologies to awaken the Divine within.