Different types of values and data can be stored in JavaScript variables. To assign values to JavaScript variables, you use the equals to "=" sign operator. The various data types in JavaScript are as follows:

• Numbers: These are just numerical values. They can be real numbers or integers. An example of the numbers data type is shown below: var id = 100
  


• Variables: The variable data type, as the name suggests, does not have a fixed value. An example of the variables data type is shown below: var y
  


• Text (strings): String data types of JavaScript are a combination of multiple characters. An example of the string data type is shown below: var demoString = "Hello World"
  


• Operations: Operations in JavaScript can also be assigned to JavaScript variables. An example of these is shown below: var sum = 20 + 30 + 29
  


• Boolean values: Boolean values can be true or false. An example of the boolean data type is shown below: var booleanValue = true
  


• Constant numbers: As the name suggests, these data types have a fixed value. An example of the constant data type is shown below: const g = 9.8
  


• Objects: JavaScript objects are containers for named values called properties. They possess their own data members and methods. An example of the objects data type is shown below:
  var name = {name:"Jon Snow", id:"AS123"}
  

Note: It is important to remember that variables in JavaScript are case-sensitive. As a result, "small" and "Small" will be treated as separate variables in JavaScript.