Confusing Concepts: Lease vs Sub-Lease

Yaar samajh nahi aaya! In Property Law, lease and sub lease kaisa difference hai? Sab kuch tohta hai isme: lease ek contract hai jo owner aur tenanT ke beech hota hai, jabki sub lease ek contract hai jo original tenant aur sub-tenant ke beech hota hai. Lekin kya ye donon hi types of agreements hai? Kya yeh both mere property rights ko affect karte hai? Maine AP LAWCET ka notes padhe, lekin kuch confusion hai. Kya ye donon hi rights hai owner ka, tenant ka ya sub-tenant ka. Kuch to sample questions padhe, lekin usme answers nahi mil raha. Please help! Kya koi bhai iska samadhan hai?