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  1. JavaScript errors occur when the interpreter encounters invalid syntax, undefined variables, or runtime issues. They can be syntax errors, runtime errors, or logical errors. Proper handling ensures your application remains stable.

    Example:

    try {
    console.log(user.name); // user is not defined
    } catch (error) {
    console.error("An error occurred:", error.name, "-", error.message);
    }
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    This catches a ReferenceError and prevents the script from crashing.

    A common cause is syntax mistakes like missing parentheses or braces. These are caught at parse time and must be fixed before execution. For example:

    // Incorrect
    console.log("Hello"
    // Correct
    console.log("Hello");
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    Another frequent issue is undefined variables or functions, which trigger ReferenceError. Always declare variables with let, const, or var before use.

    Type errors occur when performing invalid operations on a value, such as calling a non-function:

    let num = 42;
    num(); // TypeError: num is not a function
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    Fix by ensuring the variable holds the correct type before using it.

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