Initially, the concept of unfair terms characterized only the contracts concluded between consumers and professionals. Currently, the concept is also incident in other types of contracts. This study only concerns the concept of unfair terms applicable to contracts concluded between consumers and professionals. Main regulations applicable are represented by Law no. 193/2000 on unfair terms in contracts concluded between professionals and consumers and Directive 93/13 / EEC on unfair terms in consumer contracts (interpreted by the ECJ). Scientific work is proposed to set up the concept of unfair terms. In order to do so, several steps are to be followed: 1. determining the scope (contracts on the sale of goods or services concluded be...