What is the difference between formal and informal English?

Formal English refers to the language used in professional settings, academic writing, official documents, and formal speeches. It follows grammatical rules strictly, uses sophisticated vocabulary and complex sentence structures. It avoids the use of contractions, slang, and colloquial expressions.

On the other hand, informal English is the language used in everyday conversations, casual writing, and informal settings. It is more relaxed and conversational, containing contractions, slang words, abbreviations, and colloquial expressions. It often deviates from strict grammar rules and allows for more flexibility in sentence structure.

The choice between formal and informal English depends on the context and the audience. Formal English is appropriate for formal occasions, business communications, academic writing, and professional settings. Informal English, however, is used in informal conversations, personal writing, social media, and when communicating with friends or family.