What are Tier Lists and What are the Different Tiers in Honkai Impact 3rd?

http://edgarwizj635.lucialpiazzale.com/honkai-impact-the-ultimate-character-tier-list

From your makers of match giants Genshin Impact and Guns Ladies Z arrives the planet of Valkyries plus the cataclysmic occasion that spouted the setting of the video game. Honkai Effect 3rd, if not often called