These are investment which will be helpful for the investor to park their fund, which is available with them for a smaller period or they do not know when it may be required such money can be invested in this type of funds.
To understand better an individual who has sold his property and have huge proceeds and also looking for another property to invest where the builder asks him money on stage by stage completion process, then that money can be invested here for better returns compared to his savings bank account return.
Here also there are classifications defined by SEBI for the customer to choose according to their time they can stay invested in the funds.