We highly recommend using rug pad to prevent from slippery. If the rug is being used on the wooden floor or granite or marble, it is must important. You can find different types of rug pads in the market.
Few of them you may like on Amazon are:
8' X 10' ENDURANCE 32® 100-Percent Recycled Felt Rug Pad
Every rug pad varies depending on your rug type. Larger rugs may only require a Cushion rug pad whereas smaller area and runner rugs may need a good grip to prevent from slipper or accidents.