There are different types of microfibers and their characteristics (size, shape and composition of filaments) determine their properties and attributes (softness, strength, flexibility, absorption or repelling liquid, etc.) therefore make them fall into a specific type.
For example, a microfiber raincoat (made with non-split microfiber) is designed to repel water and keep the wearer dry, by contrast, a microfiber cleaning cloth (made with split microfiber) can absorb 8 times its weight in water (twice what cotton can).
The filaments of split microfiber, are star-shaped or asterisk-like, and that’s the third most important and representative feature of microfiber designed for cleaning purposes.
So in short we could say:
Microfiber or microfibre is a synthetic textile with extremely thin fibers and with many uses, but whose properties are determined by the way the are manufactured.