SPICE stands for Simulation Program with Integrated Circuit Emphasis. It is a widely used software tool for simulating and analyzing electronic circuits. Engineers use SPICE to predict how circuits will behave under various conditions, helping them design more efficient and reliable electronic systems. The program allows users to create a model of their circuit using a specific syntax, which includes components like resistors, capacitors, and transistors. By running simulations, users can observe voltage and current changes over time, making it easier to troubleshoot and optimize circuit designs before physical implementation.