Execution context (EC) is defined as the environment in which the JavaScript code is executed.
Execution context in JavaScript is of 3 types

Global execution context (GEC): default execution context in which JS code starts its execution when the file first loads in the browser.

Functional execution context (FEC): Functional execution context is defined as the context created by the JS engine whenever it finds any function call.

Eval: Execution context inside eval function.

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