Uses:

Most petroleum jelly today is used as an ingredient in skin lotions and cosmetics, providing various types of skin care and protection by minimizing friction or reducing moisture loss, or by functioning as a grooming aid

Petroleum jelly can be mixed with a high proportion of strong inorganic chlorates due to it acting as a plasticizer and a fuel source. 

Petroleum jelly can be used to fill copper or fibre-optic cables using plastic insulation to prevent the ingress of water

A stripe of petroleum jelly can be used to prevent the spread of a liquid

Petroleum jelly is a useful material when incorporated into candle wax formulas