Kirchhoff's Voltage Law (KVL) states that the total voltage around any closed loop in a circuit is equal to zero. This means that the sum of all the electrical potential differences (voltages) in that loop, including those from batteries and resistors, must balance out. Essentially, the energy supplied by sources must equal the energy used by components in the loop. KVL is based on the principle of conservation of energy, which asserts that energy cannot be created or destroyed. This law is fundamental in analyzing electrical circuits, helping engineers and technicians understand how voltage is distributed throughout a circuit.