I live in the UK and have never heard of cinderblock, what is it?
http://en.wikipedia.org/wiki/Cinderblock - easy way to describe this one. They're just concrete blocks that stack together (much like legos). They're held together with mortar like bricks. They're very common for foundation work in the US.
Another term for these is breeze block in the UK or besser block in Australia.
As the are larger than bricks a wall can be built more quickly than with bricks. They are usually used for the interior skin of a cavity wall and any interior load bearing walls.