Final answer:
Informal language typically includes slang words, which allow for quick and vivid communication within specific groups and are common in everyday conversation, unlike technical jargon and academic vocabulary used in formal contexts.
Step-by-step explanation:
The type of vocabulary often featured in informal language is slang words. Informal language includes expressions that enable groups to communicate swiftly and vividly, and it can denote familiarity with certain subjects like music, sports, or meme culture. Slang is generally considered too casual for most academic writing, but it is prevalent in everyday conversations and within certain communities or social groups. For instance, musicians might use slang in their lyrics, or youth might adopt certain slang to reflect their identity and affiliations. This informal vocabulary contrasts with technical jargon, academic vocabulary, and specialized terminology, which are typically found in more formal, professional, or academic contexts and require a certain level of expertise or education to be properly understood.