strong type

If you’ve worked with other programming languages, you might be familiar with the concept of data types. Simply put, there are different kinds of data in the world around us: numbers, letters, dates, huge numbers, pictures, and more. Most programming languages need to understand what kind of data a variable will contain, so that the language can treat the variable appropriately. For example, it wouldn’t make sense to try to subtract the word Hello from a picture of a flower, and so most programming languages won’t allow you to perform mathematical operations with anything but numeric variables. Languages that care about the type of data a variable will hold are called strongly typed languages.