Jam is a type of sweet spread or condiment made with fruits or sometimes (though rarely) vegetables, sugar, and sometimes pectin if the fruit's natural pectin content is insufficient to produce a thick product. Jam and its variations are often spread on bread, and used as a culinary sweetener, for example in yogurt.
Jam appears in some English sweet foods such as the 'Jam doughnut' (albeit in less viscous form), the 'Jam Rolypoly' (beloved of many who had to eat school-dinners as children), 'Jam Tarts' (not as rude as they sound) and 'Jammy Dodgers' (regarded by many to be the finest biscuit in the world).
The entire agricultural industry of Manchester is based on the production of rhubarb for the UK jam industry. Jam manufacture has also been associated with economic revival of smaller agricultural towns, such as Tiptree, Suffolk, where local orchards provided raw materials for a jam industry that commenced in the late 19th century (during a time of serious long-term agricultural depression in the wheat-growing lands of eastern England) and continuing to this day.