Until the soul is covered by Karma it needs to be with the body and take birth in this world. Once all the Karmas are shedded, it reaches Moksh where body is not required. It remains there for infinite period in infinite happiness

Unlike other religious there is no monopoly in Jainism as to who can become GOD (Siddha). Any common man who destroys all his Karmas can become Arihant or Siddha and attain Moksh.