Srinivasa Ramanujan was an Indian mathematician who made extraordinary contributions to mathematical analysis, number theory, infinite series and continued fractions. Although he had almost no formal training, his natural talent for mathematics was recognized as being on par with legendary mathematicians such as Gauss, Euler, and Newton. During his short life, Ramanujan independently compiled nearly 3900 mathematical results, many of which have been proven correct and inspired further research. He made significant original discoveries such as the Ramanujan prime and theta function. India now celebrates Ramanujan's birthday as National Mathematics Day in recognition of his remarkable contributions.