The 4015 is a Dual 4-Bit Static Shift Register IC commonly used in digital electronics. It features two independent 4-bit shift registers that can store and shift data in a serial manner. Each shift register has four data input (D) pins and four data output (Q) pins, allowing it to hold and transfer 4-bit data sequences.

The IC operates in a static mode, meaning it retains data without the need for a clock signal. Thus making it suitable for applications where data needs to be temporarily stored or shifted at a controlled pace. This IC finds applications in serial data transmission, data manipulation, and other digital circuits that require data-shifting capabilities.