Performance Testing is the process of measuring a system’s performance by increasing the demand on the system. It is performed to ascertain a system's behavior under normal as well as the estimated peak load conditions. JMeter is a segment of Apache Open Source project. It is an application which can be used to perform functional testing and load testing. It is designed as pure Java application and can be used to perform load testing of any type of web application including the ones written in .NET, PHP etc.