Dialects
All speakers of English can talk to each other and pretty much understand each other, yet no two speak exactly the same.
Differences can be due to age, sex, state of health, size, personality, emotional state, and personal idiosyncrasies.
The unique characteristics of the language of an individual speaker are referred to as the speakerís idiolect.
English may then be said to consist of some 4 000 000 000 idiolects, the approximate number of speakers of English