What is IPO, FPO and OFS?

Initial Public Offerings (IPO's) - A primary market is one that issues new securities on an exchange. The primary markets are where investors can get first crack at a new security issuance. The issuing company offers its equity to investors or groups and receives cash proceeds from the sale, which is then used to fund operations or expand the business. It is the largest source of funds with long or indefinite maturity for the company. 

Follow on Public Offer (FPO):- FPO (Follow on Public Offer) is a process by which a company, which is already listed on an exchange, issues new shares to the investors or the existing shareholders, usually the promoters. FPO is used by companies to diversify their equity base.

Offer For Sale(OFS):- stands for Offer for Sale & serves the same purpose as traditional mechanism of Follow-On Public Offer(FPOs). OFS enables promoters to dilute their holdings in listed companies in a transparent manner with a wider participation through exchange based bidding platform.