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Yes. Anything that can be put on the number line is real. You will learn about imaginary and complex numbers in advanced math. They are included in complex numbers but again that is very advanced math.
what is schematic diagram of real numbers and the definition of each term..?
That probably refers either to an imaginary number, or to a complex number. Despite the weird name, the "imaginary numbers" (and the complex numbers) have many uses in math and science.
An interval is a "set of real numbers." In other words say you had a problem like [5....1]. This means that everything between the 5 and the 1 are a set of real numbers (including the 5 and 1). Or like [-7, 9].
A real life example of a translation in math is a person sliding down a slide.