The IC LM324 is a quad operational amplifier, featuring four independent, high-gain, internally frequency-compensated op-amps. It is widely used in analog signal processing applications for tasks such as amplification, filtering, and signal conditioning. The LM324 operates on a single power supply, making it suitable for battery-powered circuits and various low-power electronic devices. Its versatility and low cost make it a popular choice for a range of analog electronic projects.