Kirchhoff's Current Law (KCL), which is also known as Kirchhoff's First Law, states that the total electric current flowing into a node or junction of a circuit through all possible routes leading to the junction is zero.  Worded in another way, KCL states that the sum of all the currents flowing towards a node or junction of a circuit is equal to the sum of all the currents leaving it.

Figure 1.  Kirchhoff's Current Law

The implication of Kirchhoff's Current Law is that charge can not accumulate at a node or junction of a circuit, and that charge is a conserved quantity. Kirchhoff's Current Law complements Kirchhoff's Voltage Law in formalizing the algebra for circuit analysis.