A contraction is a shortened version of the written and spoken forms of a word, syllable, or word group, created by omission of internal letters (actually, sounds).In writing, an apostrophe takes the place of the missing letters. For example: I’ll for I will, that’s for that is, etc. Contractions can be classified into two types: positive contractions which include he’ll, they’re etc., and negative contractions which include he won’t, she hasn’t etc.
Always remember that understanding the proper use of contractions can greatly improve your writing. They make your writing seem friendly and accessible and give the appearance that you are actually "talking" to your reader. When writing dialogue in a novel or play, contractions help reflect how a character actually speaks. Also, these help to save space when preparing advertisements, slogans, and other written works that must be short and to the point.
While contractions can be very useful in written English, many experts caution against the use of contractions in formal communication. Since contractions tend to add a light and informal tone to your writing, they are often inappropriate for academic research papers, business presentations, and other types of official correspondence.