Accent is a combination of three main components:
intonation (speech music), liaisons (word
connections), and pronunciation (the spoken sounds of vowels,
consonants, and combinations).
Accents are influenced by a people’s geographical region of origin, their age, social background and education, and whether they have moved away from their home area. Nowadays it may also be influenced by external factors such radio or television. Amongst speakers of English as an additional language accent is often influenced by the pronunciation and intonation patterns of the first language.
Contrary to popular belief, grammar and accent are completely different, unrelated terms. Part of the difference is that grammar and vocabulary are
systematic and structured— the letter of the language. Accent, on the other hand, is
free form, intuitive, and creative— more the spirit of the language.