Colloquialism is best defined as:

Colloquialism refers to the use of informal words, phrases, or expressions that are commonly used in everyday language, rather than in formal speech or writing. This includes slang, regional dialects, and casual conversation, which are important for conveying authenticity and relatability in communication. Choosing colloquial language can help create a sense of familiarity and ease in dialogue, making it more accessible to a general audience.

The other choices highlight different aspects of language and communication. An exaggerated statement refers to hyperbole, which is a literary device used for emphasis or effect but does not capture the essence of colloquialism. A formal style of writing indicates a more structured and serious approach to expression, often avoiding informal language altogether. Technical jargon refers to specialized terms used within particular fields or professions, which contrasts with the everyday language inherent in colloquialisms.