A tissue is one of the building blocks of an organism--either animal or plant. An organism is comprised of tissues, which are made up of individual cells. These cells share a similar structure (how they're built) and function (what they do). The study of tissues is a field known as histology.
You may be asking why tissues are important.
It's simple! Tissues are what makes up our bodies: everything from our bones to organs like our heart and brain! Even blood is considered to be a tissue!
