My daughter wants to know what is Science? (in one sentence she is only seven).?

It is a way in which human beings are trying to comprehend the unknown, all the things thts happening around us, including our very existence.Trying to give new names and formulate new ideas just to make some sense to our mind.

Here's my view: "Science is learning by asking questions and looking for things that give the answers." Probably not good -- I'd try to find some way of explaining "objective evidence to support or disprove a hypothesis", but that's way too much for a seven-year-old. The key point is that science relies on objective evidence rather than authority or opinion.

A way to explain how things happen in the world. Let her help bake a cake and explain that science makes the wet mixture form into the sponge.

Science is the attempt to understand everything in the universe.

Science is to understand how things happen as they do, and sometimes why.

Is this simple enough for a 7 years old?

It's about asking questions like "Why is the sky blue?" and "How do fishes breathe underwater?" then working out the answers.

Lots of people have done this. Scientists work things out - we understand rainbows.

Science is what helps us learn about our world from a logical and methodical viewpoint.

science is the answer to everything that happens in the world

The observation, identification, description, experimental investigation, and theoretical explanation of phenomena.

Knowledge gained by provable discovery.