The core activity of Impressions.Services encompasses three main areas: 1. **Architecture Support**: The company provides support and training for architects, particularly in the area of BIM software Allplan. 2. **Photography**: Impressions.Services offers photography services, including architectural photography, business portraits, aerial photography, and event photography. 3. **Web Design**: The company creates websites for clients. Additionally, Impressions.Services also offers training and courses in the areas of lighting and Lightroom.