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Unicellular organisms are composed of a single cell. Multicellular organisms are composed of many specialized cells. Specialized cells differ in structure (size, shape...) and function (the role they perform in the organism).
multi-cellular: an organism with 2 or more Cells (multi = many). A multicellular organism is an organism made up of more than one Cell, such as you, me, dogs, cats, birds, bugs, etc. They are complex. They are much much bigger than unicellular organisms and have more body functions. A unicellular organism (also called single cell organism) is an organism made up of only one Cell. Algae, some types of fungus, and bacteria are some examples. These organisms are not very complex, and all their body functions are carried out in that single tiny Cell.