In javascript, several different kinds of errors can arise. But when I'm working with javascript, these two errors are the ones I experience most frequently in my browser. In general, typeErrors and Reference Errors are runtime errors, which arise as the code is being executed.

Type Error:

A type error happens when two types aren't compatible, for as when you wanted to access a variable with one datatype but mistakenly declared it with another. In some circumstances, JavaScript will automatically execute type conversion to permit an operation to proceed without raising a type error.

Here are some examples of when a type error is thrown:

1. When attempting to modify a value that can't be modified.

    const name="Bijaylaxmi";
    name="Laxmi" //This will throw a "TypeError: Assignment to constant variable" error
   

2. A non-function is called as a function.

    let x = 42;
    x(); // This will throw a "TypeError: x is not a function" error.
   

3. Converting a value to a type cannot be converted to.

    console.log(Number("hello")); // This will log "NaN"
   

Reference Error:

When you declare a variable in JavaScript, a memory location is assigned to hold the value of that variable. A reference error will occur if you attempt to access a variable that hasn't yet been declared or given a value since its name doesn't yet correspond to a memory address.

Here are some examples of when a reference error is thrown:

1. Using a variable that hasn't been declared yet.

    console.log(x); // ReferenceError: x is not defined
   

2. A variable or function being used outside of its scope.

    function printNumber() {
      var a = 10;
    }
    console.log(a); // ReferenceError: a is not defined
   

3. Incorrect spelling of a function or variable name.

    const number=22;
    console.log(numbr); //ReferenceError: numbr is not defined
   

Conclusion:

When you perform an operation or use a value of a type that is not valid or does not support that operation, you get a TypeError, whereas a ReferenceError occurs when you try to access a variable or function that has not been declared or defined.