People keep money in Savings account for its ease of access and safety. While the money stays safe in the savings account however, more often yields low post tax and inflation adjusted returns.
Liquid funds are one of the ideal avenues to parking short term idle cash with an option to earn potentially tax efficient returns.
These funds are ideally meant for money that you do not want to block in longer term investments such as shares, fixed deposits, government bonds, etc. Consider such funds when you need the money back in a very short time period.