Hi Abhishek,
Let me jump in to give you a brief explanation of Cisco AutoQos.
Configuring QOS can be a challenge for engineers who aren’t familiar with this topic, but leaving the network without a QOS configuration can cause a lot troubles especially with the bandwidth-hungry applications and the real-time traffic such as VOIP and Video which can partially and/or fully not work if QOS isn’t configured, in addition of problems like latency, jitter, and packet drops.
For this reason, Cisco IOS Software offers a portfolio of QoS features which is enable by a or few commands without an extensive knowledge needed from the IT administrator and it provide the essential QOS needed.
If you want to know more of AutoQOS, I can refer you to this article from Cisco Wesbite.