Netzwerk is a modular German-as-a-Foreign-Language (DaF - Deutsch als Fremdsprache) textbook series. It is designed to lead learners from level A1 (Beginner) to B1 (Intermediate) based on the Common European Framework of Reference for Languages (CEFR).
The A1 level is split into two volumes to facilitate incremental learning: netzwerk a1 pdf