<ul data-eligibleForWebStory="true"><li>A runtime environment is where your program will be executed, impacting how it runs and the global objects accessible.</li><li>JavaScript has two main runtime environments: a browser's runtime environment and the Node runtime environment.</li><li>In a browser's environment, JavaScript code can access the window object for functionalities like alerts, prompts, and confirms.</li><li>In the Node runtime environment, JavaScript can be used for backend applications, granting access to server features like file systems, databases, and networks.</li></ul>

Introduction to JavaScript Runtime Environments

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