Please elaborate Th´evenin’s Theorem?

Th´evenin’s theorem provides a useful tool when solving complex and large electric circuits by reducing them to a single voltage source in series with a resistor. It is particularly advantageous where a single resistor or load in a circuit is subject to change. Formally, the Th´evenin’s theorem can be stated as:

“Any two-terminal linear electric circuit consisting of resistors and sources, can be re-placed by an equivalent circuit containing a single voltage source in series with a resistor connected across the load.”
he following steps outline the procedure to simplify an electric circuit using Th´evenin’s theorem
where VTH and RTH are the Th´evenin’s voltage and Th´evenin’s resistance respectively.
1. Remove the load resistance RL.
2. VTH is the open circuit (OC) voltage across the load terminals and
3. RTH is the resistance across the load terminals with all sources replaced by their internal resistances.

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