For school platforms like (Спрашивай) or homework help sites (GDZ), an "informative" answer is one that is accurate, complete, and understandable for a 4th-grade student. Фоксфорд.Учебник — Главная
Information that is important and useful at the present moment.
If you are looking for the "informative feature" (информационная характеристика) as a concept for a 4th-grade computer science assignment, it generally includes the following properties:
Sufficient information to understand a situation and make a decision.
Information expressed in a language or form that the recipient can grasp.