Unrealized profit/loss is a profit/loss from an investment that has not yet been sold or squared off.
Unrealized gains would occur when the current price of a share is higher than the price you paid while buying the share, while unrealized losses would occur when the current price of a share is lower than the price you paid while buying the share.
The gain/loss becomes realized once the investments are sold / squared off.
To check your unrealized profit/loss login to the Kotak Securities Neo app and refer the investments tab under portfolio. For steps to download the app refer FAQ here