Slack is probably the most widely used communication and collaboration tool for work groups in the business sector. In addition to the creation of channels, which are used for chats, Slack also offers the possibility to make audio and video calls. Histories can be easily searched in Slack. The application also offers the possibility of integrating external companies and employees into the communications beyond one's own company. Furthermore, there are various options for connecting third-party apps.
By the way, we have the largest German-speaking no-code community on Slack! You can become part of it here.
The company Slack Technologies, Inc. is based in the USA. After the end of the Privacy Shield agreement, Slack has taken various steps to continue to comply with the GDPR guidelines. When setting up your Slack environment, you can choose on which servers your data should be stored. Among other things, servers within the EU can be selected here. Nevertheless, Slack data is processed by Amazon Web Services and transferred to the USA. When using Slack, it is recommended to conclude an order processing agreement with Slack (https://slack.com/intl/de-de/terms-of-service/data-processing).
Source: https://slack.com/intl/de-de/trust/compliance/gdpr
Further information: https://easyrechtssicher.de/slack-datenschutz/