A slow cooker is also called a "crockpot." It's an electric cooking unit with a glazed clay pot (crock) that fits inside and is covered with a lid, usually transparent glass. It looks rather like the electric rice-cookers you find in some Oriental markets. The idea is that it cooks very slowly over low heat, using about as much electricity as a regular lightbulb (not the saver kind, the filament kind). So a dish that would take an hour in the conventional oven will take maybe 5 to 8 hours in a slow cooker. The idea is that you can put all your ingredients in the pot and plug it in and just leave it all day or all night, it won't boil over, stick or burn, and when you get up in the morning, or get home from work, there's your meal ready and waiting.
Of course if you have any experience cooking, you can transpose the recipes to regular cooking methods. And if you don't have much experience, find someone who does...an aunt, a cousin, a mom... ;)
You can buy "slow cookers" or "crockpots" on the Internet, a friend of mine brought me one to Spain from England. If your electricity is the same as England's (and it should be), you can get one from there on the Net. Just Google the words "slow cooker". Bear in mind tho there probably won't be a plug on the end of the flex, you'll have to go to the hardware shop and get one. Don't ask me why, but a lot of English appliances come without a plug!
They are a real boon sometimes when you're really busy and well worth having.
Hope this information helps!