The core activity of HumanDigital GmbH consists of three main areas: 1. **Web Development**: Development and maintenance of web projects of all sizes, from simple one-page websites to complex web applications with database connectivity. 2. **Mac Support**: Support for Apple computers and servers, networks, and peripheral devices, for both private individuals and small to medium-sized enterprises. 3. **VoIP Telephony**: Setup and maintenance of VoIP telephone systems, from simple connections to extensive systems with external telephone exchanges for multiple branches and home office applications.