This document discusses improper integrals of the first and second kind. It was prepared by four civil engineering students and guided by Heena Parajapati. The document introduces improper integrals as limits where either the interval of integration is infinite or the function is singular. Improper integrals of the first kind have an infinite interval, while improper integrals of the second kind have an unbounded integrand within the interval. Examples of each type of improper integral are provided.