Computers are sophisticated and can make use of more complex variables than just numbers. This is where variable types come in. Variables come in several types and different languages support different types.
The most common types are:
String: a line of text like "boat", "elephant" or "damn, you are tall!"
Boolean: either true or false, but nothing else
Arrays: a collection of values like: 1,2,3,4,'I am bored now'
Objects: a representation of a more complex object
var keyword to indicate that you are declaring a variable, and the interpreter will work out what data type you are using from the context, and use of quotes.