What is a probe card?

A probe card is a jig used for electrical testing of an LSI (large-scale integrated circuit) chip on a wafer during the wafer test process in LSI manufacturing.
A probe card is docked to a wafer prober to serve as a connector between the LSI chip electrodes and an LSI tester as a measuring machine. The needles of the probe card contact the LSI chip electrodes to conduct electrical testing for the go/no-go test.
The wafer test process is highly important and highly dependent on the reliability of probe cards.