Regression testing is any type of software testing that seeks to uncover new errors, or regressions, in existing functionality after changes have been made to a system, such as functional enhancements, patches or configuration changes.

Stress testing (sometimes called torture testing) is a form of deliberately intense or thorough testing used to determine the stability of a given system or entity. wikipedia.org

End-to-end testing is a methodology used to test whether the flow of an application is performing as designed from start to finish. The purpose of carrying out end-to-end tests is to identify system dependencies and to ensure that the right information is passed between various system components and systems. wikipedia.org

Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. wikipedia.org

Load testing is the process of putting demand on a system or device and measuring its response. Load testing is performed to determine a system's behavior under both normal and anticipated peak load conditions. wikipedia.org

Performance testing is in general testing performed to determine how a system performs in terms of responsiveness and stability under a particular workload. wikipedia.org

Cucumber is a tool for running automated acceptance tests written in a behavior driven development (BDD) style. Cucumber is written in Ruby programming language. Cucumber allows the execution of feature documentation written in business-facing text. wikipedia.org

Apache JMeter is an Apache Jakarta project that can be used as a load testing tool for analyzing and measuring the performance of a variety of services, with a focus on web applications. wikipedia.org

Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. wikipedia.org

Mobile application testing is a process by which application software developed for hand held mobile devices is tested for its functionality, usability and consistency. wikipedia.org

A test case in software engineering is a set of conditions or variables under which a tester will determine whether an application or software system is working correctly or not.

Manual testing is the process of manually testing software for defects. It requires a tester to play the role of an end user, and use most of all features of the application to ensure correct behavior. wikipedia.org