The dhak is a large drum from Bengal and Assam. It can be almost cylindrical or barrel-shaped. The way the hide is stretched over the opening and tied together varies. It is hung from the neck, tied around the waist, or placed on the lap or the ground. It is usually played with wooden sticks. The left side is covered with a special material to make the sound deeper.

The dhak has been around since medieval times. It is used during Hindu religious festivals in the region, especially those of the Sakta and Shaiva traditions, such as Durga Puja, Kali Puja, and Charak Puja.

The drum's beats, played by the Bengali Hindu community, are an important part of Durga Puja in Bengal. They are played along with the arati, which is a type of dance. In Assam, the tea tribes play the dhak with the nagara, another instrument.

The Statesman wrote, "Durga Puja is not a festive event without the loud beats of the dhak. People hang the drum around their necks and use two thin sticks to create a lively rhythm. These sounds make people feel the excitement of Durga Puja."

The dhak is also played during Islamic festivals, such as Muharram, in Bengal.