Explain the nodal analysis method and its systematic approach.

Nodal analysis uses KCL to write equations at each non-reference node in terms of node voltages. The steps are: identify all nodes and select a reference (ground), assign voltage variables to unknown nodes, apply KCL at each node expressing currents in terms of node voltages using Ohm's Law, and solve the resulting system of equations. It is efficient for circuits with fewer nodes than meshes.