Usage describes the way a language is used by native speakers, it is the application of grammar rules at a local level. English usage varies from region to region in multiple ways including word choice, syntax, spelling and the use of idioms.
Grammar and usage are inextricably linked. Grammar is a system of rules that dictates multiple ways in which sentences may be composed. Usage is the preferred way native speakers compose their sentences, within the rules of grammar. Usage changes quickly, driven by necessity, etiquette, expediency and whim. Sometimes, usage defies grammar. If a certain type of usage becomes widespread and entrenched in the language, it will eventually become part of the system of rules known as grammar.
English is a living language, proved by its ever-changing usage. Grammarist is here to explain the language we use today that is virtually unchanged for hundreds of years, as well as the newly coined language of today.