The prohibition of abuse of dominance under Article 102 TFEU aims to protect competitors and consumers from unilateral harmful behavior by an undertaking which occupies a dominant position within the internal market or a substantial part of it.
In order to ascertain whether Article 102 TFEU applies, it is necessary to establish (i) what the relevant market is; (ii) whether the undertaking is dominant on that particular market; and (iii) whether the conduct of the dominant undertaking constitutes an abuse.