String cheese refers to several different types of cheese where the manufacturing process aligns the proteins in the cheese, which makes it stringy. When mozzarella is heated to 60°C, the milk proteins line up. It is possible to peel strings or strips from the larger cheese.
In Slovakia, korbáčiky is made, which is a salty sheep milk cheese, available smoked or unsmoked. It is traditionally made by hand-pulling steamed sheep's cheese into strings and braiding them. Machine milk versions are also available.
In Armenia, traditional string cheese is made with a white base. The type of milk used usually comes from an aged goat or sheep depending upon the production methods of the area of choice. It includes black cumin and a middle-eastern spice known as mahleb, and it comes in the form of a braided endless loop. The cheese forms strings because of the way it is pulled during processing. There is also Syrian cheese processed this way. Other cheeses are only cut and pressed, not pulled, and don't develop strings.
Cheestrings became a popular snack in the UK and Republic of Ireland in the early 1990s. They are made from processed cheese by Kerry Group and the mascot is a cartoon character called Mr Strings. The original advert had a theme tune based on the popular song "Bend Me, Shape Me", but with different lyrics ("You got a cheese string day or night, you got a cheese string you're all right"). The first version of this advert was set at a kids' disco, and a later remake was set at a funfair. Originally Mr Strings was a wild cartoon character who pulled himself apart but by the late 1990s the packaging had been redesigned with a more simplified mascot. On television the original Mr Strings was phased out during the mid 2000s and replaced by an unseen character who played creepy practical jokes on teenage consumers. In the late 2000s the design of Mr Strings was changed for a third time to appear more child-friendly and was given a new catchphrase ("Hey, I'm just cheese").