Original: In numerical analysis, Newton's method (also known as the Newton Raphson method), named after Isaac Newton and Joseph Raphson, is perhaps the best known method for finding successively better approximations to the zeroes (or roots) of a real-valued function.
Simplified: In math, Newton's method (also known as the Newton–Raphson method, named after Sir Isaac Newton and Joseph Raphson) is a method for finding the zeroes (or roots) of a function whose values are all real.