Dear Jayant,
TCS Refers to Tax Collection at Source and is a Part of Mechanisms under income Tax Act,1961. The TCS Is Just Like TDS, Where Tax is Collected At Source.
The Seller Who collects the Tax From the Buyer Under TCS Mechanism will issue a TCS Certificate. which the Buyer can Claim against Income Tax , Just like TDS, At the end of the Year, While Filing Income Tax Return.
You Can refer Below Link: https://www.exploreincometax.com/Income-tax-Ready-Reckoners/tcs-rates-tcs-compliances .. This Explains Everything about TCS Mechanism and Explains you in detail about TCS.
If you need Bare Act on TCS you can Refer Link: https://www.exploreincometax.com/Indian-Income-tax-Act-1961/Section-206C