StaticRegister - Rarely or never changes; language is "frozen" in time, content, and form.
Formal Register - Used in formal settings; follows a commonly accepted format; impersonal and formal.
Consultative Register - Standard form of communication used when consulting an expert; language is precise and formal.
Casual Register - Informal language used among peers and friends; conversational tone; includes slang and colloquialisms.
Intimate Register - Private communication reserved for close family members or intimate individuals; best avoided in public and professional situations.