Is a dirty martini the same as martini?

No, a dirty martini is not the same as a martini. A regular martini is made with just gin and dry vermouth, while a dirty martini is made with gin, dry vermouth, and a splash of olive brine. This gives the drink a slightly salty and briny flavor. Additionally, a dirty martini is typically garnished with an olive, while a regular martini is garnished with a twist of lemon.