Cyclic Paraffins are commonly referred to as naphthenes (note: NOT naphthalene), and aren't very common I believe.
Paraffins are, just like chemisttree said, non-cyclic.
Cyclic paraffins may include methylcyclopentane, cyclohexane, methylcyclohexane. dimethylcyclohexane.
And, well, paraffins are just alkanes with the formula [tex]C_{n}[/tex][tex]H_{2n+2}[/tex],
that includes tons of hydrocarbons, methane, octane, etc.