When using Youtube, your data is processed in the USA. The USA is not accorded an adequate level of data protection by the European Court of Justice. In particular, there is a risk that your data may be subject to access by U.S. authorities for control and monitoring purposes and that no effective legal remedies are available against this.
You can specify which cookies may be used by selecting the respective slider in the cookie settings. In particular, you can decide whether or not to give your consent to the transfer of data to the USA (by selecting the "Youtube" sliders). Please note that based on your settings, not all functions of the site may be available anymore.