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Unicellular organisms are the organisms which have only one cell and multicellularorganisms are organisms which have more than one cell
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not useful for me that i also know you naughty
u asked only difference
1 .The organisms which have only a single cell are called unicellular organisms.
2 .These organisms have less well developed cell organelles in them.
3 .example - Amoeba , Euglena

1 .The organisms which have more than one cells are called multicellular organisms.
2. These organisms are more developed and have better cell organelles.
3. example - Animals , Humans