A UCITS ETF is an exchange-traded fund that complies with the UCITS (Undertakings for Collective Investment in Transferable Securities) regulations of the European Union. These rules are designed to provide investor protection, transparency, and diversification.

Most ETFs available to retail investors in Europe, including Germany, are UCITS ETFs. They follow strict standards regarding risk management, asset diversification, and reporting requirements.

Because of these protections, UCITS ETFs are considered one of the most popular and accessible investment vehicles for long-term investors in Europe.