When the Reserve Bank of India (RBI) reduces the Cash Reserve Ratio (CRR), it impacts directly on the credit creation process in an economy. CRR is a certain percentage of a bank’s total deposits that has to be maintained in form of cash with RBI. By reducing CRR, RBI can increase the amount available with banks for lending.
Here is the explanation:-

1.Increased Liquidity: As explained above, reduction in CRR leads to release of some part of [banks near-cash asset] as reserves and therefore permits banks to supply more credit.
2.Lower Borrowing Costs: When banks have access to more funds to lend, they may reduce interest rates on loans because they do not need to compete as aggressively for deposits as they would when their reserves are limited.
3.Boost to Economic Activity: With greater lending capacity at lower rates of interest, banks are able to assist not only new businesses† but also existing firms in expanding and generating additional employment and output. Consumers, too, are more likely to borrow in order to make purchases† thus contributing† to further spending.
4.Multiplier Effect: The additional lending leads to a multiplier effect in the economy – when banks lend more, it increases the deposits with banks by borrowers, which in turn increases the possibility of further lending, thus creating more credit on its own.
So, effectively, RBI reduces CRR to infuse liquidity in banking system, increase borrowings at lower cost and boost economic growth through increased credit creation.