A 'dialect' is a form of a language that is spoken in a particular region or area that uses some of its own vocaulary, grammar and pronunciation. In Italy, for example, there are many different dialects some of which are quite close to standard Italian (which comes from the Tuscan dialect) and others which are so different that Italians from another region have problems understanding. 'Jargon' is the language used for a particular activity or by a particular group of people. For example 'medical jargon.' 'legal jargon.'

Dialect is variation between different groups of speakers of the same language. For example, American English and British English are dialects of English. There's also dialects within American English (General American, Mid-Atlantic, etc) and within British English (Received Pronunciation, Cockney, etc.) They are natural and usually can be understood by speakers of the same language (not everyone agrees on that, though). Jargon is a set of specific words used by a specific group of people that usually can't be understood by anyone outside of that group, even within speakers of the same language. The group is usually some kind of field of study or of work. For example, the average English speaker probably wouldn't understand what an "intervocalic voiceless bilabial fricative" is-- that's linguistics jargon. Also encountered a lot with computers; most speakers wouldn't understand what a "random-access memory fault" is, either.

dialect means a form of language use in certain areas. but jargon means the language corrupted or simplified from main language and use by some people or profession.

Hi! Мой английский не так богат и я отвечу вам по-русски. dialect (диалект) - это форма существования языка определённой группы людей, проживающих на отдельной местности и использующие слова, которые отличаются от других слов используемых в других территориях. jargon (жаргон) - слова, которые используются везде, где и существует тот или иной язык, но они не литературные (грубые, вульгарные, чаще ругательные).