Real numbers are numbers that we normally use like 1,2,3,4,5... and so on. Real numbers doesn't include any negative number because you can't use them in real life. For example, you can't have -1 or -2 apples or anything in real life. The limit is 0.
Real numbers are all the rational numbers such as -7 and 4/3 and all irrational numbers. Real numbers are used mainly in counting and are used in measurement which is always present in real-world situations. These numbers help us to quantify things around.
