The long tail, in other words long tail. It is the term for a long, extended key phrase that consists of many words. It is also worth mentioning that very often the long tail is a niche phrase. What's more, it is also great for client-specific SEO, as the phrase can be highly personalised. For example, if we deal with air-conditioning service in a big city, it is worth focusing on positioning for the phrase "repair of air-conditioning Warszawa Śródmieście", rather than the general phrase "air-conditioning".