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Define 'poco'?
What does "Class POCO"?
the only thing that comes into my mind is the abbreviation "POCO" for "Plain old C-Object" (or "POJO" for "Plain old Java-Object") which denominates a very simple Object that only has some simple attributes and setters/getters for this - no other logic or functionality.
One meaning of POCO is "Plain Old CLR Object". This is commonly used to describe objects when using the Entity Framework. For example
It would really help though if you gave us more context. In particular what language or environment you're referring to.