What primitive data types do you know in JavaScript?

In JavaScript, the following primitive data types exist:

• Number — a numeric type, includes integers and floating-point numbers.
• String — a sequence of characters.
• Boolean — a logical type, takes values true or false.
• Undefined — a type of value that has not been assigned to a variable.
• Null — a special value representing "no value".
• Symbol — a unique and immutable identifier.
• BigInt — for representing integers of arbitrary length.

Primitives in JavaScript are immutable and are passed by value.