Selenium is an open-source project for automating web browsers—not a single program you install. For a first code-based test, start with Selenium WebDriver: choose a supported language, install its Selenium binding, and use a browser. Selenium Manager is integrated into the bindings by default to manage drivers and browsers in the normal supported setup. For quick record-and-playback, consider Selenium IDE; for distributing tests across machines and browser environments, look at Selenium Grid.
The Selenium homepage currently lists version 4.49, released September 9, 2026, and its news index includes a later coding-agent article and a notice about a change expected in 4.51. Release and compatibility details can change, so check the official Selenium homepage and news index before updating.
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What is Selenium?
Selenium is an umbrella project for tools and libraries that automate web browsers. Its homepage sums up the goal as “Selenium automates browsers. That’s it!” The project documentation describes a range of tools and libraries, so it is more accurate to think of Selenium as a toolkit than as one monolithic application.
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The main pieces serve different needs:
- WebDriver is the code-based interface for controlling a browser, locally or remotely. Selenium describes WebDriver as a W3C Recommendation.
- Selenium IDE is a browser extension for recording and replaying user actions, suited to simple workflows and an introduction to browser automation.
- Selenium Grid distributes test execution across machines and helps manage multiple browser and operating-system environments centrally.
The right starting point depends on whether you need to write code, how many environments you must cover, and whether recording a simple flow is enough. See the official project documentation for the project overview and component details.
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Is Selenium for you?
Selenium is a fit when you need code-driven control of web browsers for tasks such as testing a site or automating a browser workflow. WebDriver supports local control and remote execution through Selenium Server. If your need is only a small recorded sequence, IDE may be simpler. If you need to run tests across several machines and browser/OS combinations, Grid addresses that distribution problem.
Language choice is another practical consideration. The Selenium overview lists examples for Java, Python, C#, JavaScript, Ruby, and Kotlin. The project’s GitHub documentation lists API documentation for C#, JavaScript, Java, Python, and Ruby. Check the current documentation for the binding you intend to use rather than assuming every feature or API is available identically in every language.
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How do I get started with Selenium?
For WebDriver, you need a Selenium language binding and a browser. The driver is the component that communicates between Selenium and the browser. Selenium Manager, a command-line driver and browser management tool implemented in Rust, is used by Selenium bindings by default. In the normal supported setup, you do not need to separately download a driver or add special code to manage it.
- Choose a language binding from the current Selenium documentation.
- Follow the official getting-started guide for installation prerequisites and the setup flow for that language.
- Use the language-specific first-script guide to launch a browser, navigate to a page, and close the session. Follow its current package and browser instructions rather than relying on an old copied setup recipe.
- When the first script works locally, decide whether your project needs broader browser coverage or remote/distributed execution; consult the WebDriver and Grid documentation for those next steps.
Selenium’s documentation is extensive and free, and it includes small launch, navigate, and quit examples. A book can provide a more structured learning path, but it is supplementary rather than a requirement to begin.
What is new in Selenium?
As of the homepage snapshot dated September 29, 2026, Selenium lists version 4.49 as released September 9, 2026. The same news index lists David Burns’s September 29 post, “Your Agent Learned Selenium From My Old Blog Posts,” describing a documentation page added to address recurring incorrect code produced by coding agents.
The index also lists Diego Molina’s September 21 notice, “Upcoming Breaking Change: ExpectedCondition Drops Guava’s Function Interface.” It says that starting with Selenium 4.51, ExpectedCondition will stop implementing Guava’s Function interface and points affected users to migration guidance. Treat this as a forward-looking compatibility notice, not as a statement that the change is already in 4.49. Check the linked release and migration details on the official news index before changing a project. The listed release headline does not establish that every language binding has identical package state.
What are WebDriver and WebDriver BiDi?
WebDriver gives test code a language-neutral API and protocol for browser control. A browser driver handles communication between that API and the browser implementation. Selenium documents WebDriver as a W3C Recommendation; its WebDriver guide explains the model and supported capabilities.
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Move to Selenium Grid when running on one local browser is no longer enough—for example, when you need executions across several machines or a centrally managed set of browser and operating-system combinations. Grid is the Selenium component for distributing and running tests in those environments. Start by identifying the browsers, operating systems, and execution setup your tests actually need, then use the official documentation to configure the appropriate Grid arrangement. WebDriver’s remote-control model is the bridge from test code to a browser running elsewhere.
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