FBM: Ssub launched, shorter range, slightly less punch. They'd be launched off the coast of the enemy country (or as close as possible, but still launched from the ocean). Typical US models include the Polaris, Poseidon, and Trident series. Changes went from a single warhead and a range of a few hundred miles to up to seven MIRVs and a 4,600 mile range.
ICBM: In the US, ICBMs are massive missles in stationary launch facilities that are hardened against nuclear attack. They have enough range to get from the US to anywhere in Russia, and carry a tremendous punch. The Russian models are simmilar, except they are on mobile rocket launchers. Typical US models include the Titan series, the Minuteman series, the Atlas series, and the latest, the Peacekeeper.
The Minuteman III has a 6,000 mile range, and prior to the 1992 Arms talks carried three MIRVs. The Peacekeeper was developed at the end of the cold war and carried four MIRVs a range of 6,000 miles with greater accuracy than anything built previously for the US arsenal. Due to arms reduction treaties, the US has agreed to scrap the Peacekeeper by this year, though I doubt that'll happen with this government.
I don't know about North Korean, Indian, Pakistani, French, British, Russian, Chinese or Israeli nukes. For those, hit google.