Formerly known as Article 81 of the EC Treaty. Article 101 of the Treaty on the Functioning of the European Union (TFEU). This prohibits as anti-competitive all agreements, decisions and practices between undertakings and concerted practices which may affect trade between EU member states and which have as their object or effect the prevention, restriction or distortion of competition within the internal market.

For further details, see Practice note, Overview: EU competition law.