A Pidgin is a linguistic makeshift that enables two cultures to communicate for purposes of trade, etc.; A Creole is a Pidgin that has become a culture's primary language.
"a" is an indefinite article. The English rules for when to use the indefinite article and when to omit it are complicated, and are usually learned by experience.
Linguistics is the scientific study of human languages. Linguistics can be broadly broken into three categories or subfields: the study of language form, of language meaning, and of language in...