An increase in reverse repo rate can prompt banks to park more funds with the RBI to earn higher returns on idle cash. It is also a tool which can be used by the RBI to drain excess money out of the banking system.
The rate at which the RBI lends money to commercial banks is called repo rate. It is an instrument of monetary policy. Whenever banks have any shortage of funds they can borrow from the RBI.
A reduction in the repo rate helps banks get money at a cheaper rate and vice versa. The repo rate in India is similar to the discount rate in the US.
Thus, we can conclude that Repo Rate signifies the rate at which liquidity is injected in the banking system by RBI, whereas Reverse repo rate signifies the rate at which the central bank absorbs liquidity from the banks