Stochastic Context-free Grammar (SCFG) is a type of grammar used in computer programming and linguistics. It is a way of understanding how words and phrases are structured in a language. SCFG uses a system of rules to determine the meaning of words and phrases. For example, in English, the phrase "the cat sat on the mat" follows the rule that sentences have a subject (“the cat”), a verb (“sat”), and an object (“the mat”) in that order. In SCFG, the rules used to determine the meaning of words and phrases are based on probability instead of just following a set of rules. This means that there is no one-size-fits-all set of rules that works for all languages. Instead, the rules used for grammar will be different for each language, and each language will have its own set of probabilities.