Probe cards play a crucial role in testing integrated circuits before they are used in electronic devices. They establish electrical connections between test equipment and chips, enabling precise measurements to identify defects. Probe cards consist of an array of microscopic probes that make contact with bond pads on chips. Their design and manufacturing requires high precision to ensure proper contact and avoid damaging chips. As chip technology advances, probe card design has evolved to allow for higher density probing and testing of multiple chips simultaneously.