Cheese analogue
Cheese analogues (more widely known as cheese alternatives) are products used as culinary replacements for cheese. They are usually products made by blending cheaper fats or proteins and used in convenience foods. The category includes vegan cheeses as well as some dairy-containing products that do not qualify as true cheeses, such as processed cheese. These foods may be intended as replacements for cheese, as with vegan products, or as imitations, as in the case of products used for salad bars and pizza-making, which are generally intended to be mistaken for real cheese, but have properties such as different melting points or lower costs that make them attractive to businesses.

Vegan cheese 
Vegan cheese may be made from soybeans, rice, almonds, nutritional yeast and other non-dairy ingredients. It is aimed at vegans and others wanting to avoid animal products, for moral, environmental, religious or health reasons, including lactose intolerance or a desire to avoid cholesterol. Vegan cheeses may be lower in fat compared to dairy cheese, are cholesterol-free and are often a source of soy protein and isoflavones. Many have calcium added. Several brands melt similarly to dairy cheese, while others stay mostly firm, or melt only when grated.

Analogue pizza cheese

One variant of pasteurized processed cheese dairy products is, according to a hospitality industry source, designed to melt well on pizza, while remaining chewy; this has been described as "artificial cheesy substance that's much quicker and cheaper to produce than the real thing". In many cases the dairy fat required for anything described as cheese is replaced by cheaper vegetable oil and additives; this is not illegal if not described as cheese.

These products are sometimes referred to as "analogue pizza cheese". They are used on some commercially produced pizzas. They may be formulated for processing with basic cheese-making equipment, but without the additional equipment and processing that mozzarella cheese requires, such as the processes of mixing and molding. They tend to have a soft texture and once melted, may have a slightly "stringy" quality when pulled or bitten into. They may lack in a fusion, or melt together when cooked.
It has been stated that pizza cheese appears to be the leading type of cheese analogue produced globally. In 1987 it was asserted that—at that time—each year in the United States over 700 million frozen pizzas were sold, three quarters of which contain cheese substitutes.

References 

 
Imitation foods