The cell is the fundamental structural and functional unit of organisms. Bodies of organisms are made up of cells of various shapes and sizes. Groups of similar cells aggregate to collectively perform a particular function. Such groups of cells are termed tissues.
A tissue is a group of cells with a common origin, structure and function. Several types of tissues organize to form an organ.
Examples: Blood, bone, and cartilage are some examples of animal tissues whereas parenchyma, collenchyma, xylem and phloem are different tissues present in the plants.
The study of tissues is called histology.
Plant and Animal Tissues