- A WebBrowser is a front-end to a website http server
- A WebDriver is a front-end to a specific WebBrowser that controls interaction with a website
- Selenium-Server is a front-end to a WebDriver that provides API calls to interact the WebDriver over HTTP
- Theoretically, Selenium Server provides a library of actions/listeners/utils and the WebDriver provides the custom browser implementation
- Selenium Server does nothing without a WebDriver
- Language bindings provide a language-specific API and interface to Selenium Server API
- The language bindings expose/translate API calls to Selenium Server
- Available Selenium Server functions are dependent on the Language Binding
- Language bindings can differ in their class hierarchies, API structure, and available functions.
- SeleniumCore = Webdriver: chromedriver.exe, iedriver.exe, geckodriver.exe
- SeleniumServer = selenium-server-version.jar
- LanguageBindings = native language library that exposes SeleniumServer API
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