No strings attached means accepting or offering something without any demands, conditions or requirements. No hidden clauses or obligations need to be fulfilled.
It is like taking something at its face value without any restrictions or any unseen catch involved.
It is also used when there are no bindings or expectations of any sorts in a commitment.
1. The shopping mall next door is offering a flat discount on all its products with no strings attached.
2. Parents shower their children with love and affection with no strings attached.
3. The offer to teach in the nearby school looked convenient and attractive and had no strings attached to it.