As well as a country, Iceland is also, perhaps less excitingly, a British supermarket chain.
Most of its food is frozen, and stored in massive freezer units that take up most of the store. The products also tend to be sold at a lower price to those at its main competitors, Tesco and Sainsbury's.
It also set up the world's first national Internet grocery shopping service, in 1997. Since then, many companies have followed suit - Sainsbury's To You is a good example - but few have matched its ease of use and value for money. In particular, it's notable for having no delivery fee.