What is the difference between Selenium and Zelenium?

Selenium is an open-source set of tools for automating web applications across various browsers and platforms. It includes Selenium WebDriver for writing tests, Selenium IDE for recording and replaying tests as a browser extension, and Selenium Grid for parallel test execution on multiple machines. The main focus is end-to-end testing of web interfaces.

Zelenium (also known as Zalenium) is an extension of Selenium Grid that adds functionality for viewing video recordings of test executions and screenshots of failed tests. Zelenium uses Docker images of Selenium to run tests in an isolated environment and integrates with tools for viewing videos and screenshots. This allows for better debugging of failed tests and analysis of their results.

The main difference lies in the focus: Selenium is a basic framework for automating web tests, while Zelenium is a tool that extends Selenium Grid capabilities by adding visualization tools for test execution results to facilitate debugging. Zelenium uses Selenium.