Well, from the preceding chapter, you might remember the definition of pointers. Let's recap so that we can look at a better definition and learn about the usages of pointers.

You already know that a variable holds data. Say, an integer holds an integer number, a string holds a collection of characters, or a float holds a floating-point number. Each of the data types holds different types of data. Pointers are kind of similar to the variables, but they hold the memory location. Let's make it clear.

The variables hold information. The information is saved somewhere in our computer or Arduino. The information can be anywhere in our computer or Arduino. By declaring a pointer, we can find exactly where the variable is saved.

To make our definition shorter, we can say a pointer is just a variable, as in int, char, float, double, and so on.

Say, a box is like a variable. In a box, we can put things. So, a box can have some space. In programming, we may call it memory. Every variable has...