This question is both broad and deep! Scientists help us in many areas of our daily lives, such as health and medicine, materials, new technologies, and offering explanations of how things came to be. Health and medicine are important because they contribute to higher standards of living; this helps people live longer and survive diseases that could otherwise be deadly or seriously debilitating. Materials are important aspects of our daily lives: material technologies are found in the personal care products we use, like shampoos, creams, or soaps. Other examples of materials we often use are plastics, adhesives (tapes, glues), paints, fabrics. Furthermore, there are exciting uses for nanomaterials! And what would the world be without technologies such as the computer, cell phone, or microwave? Scientists are also interested in explaining how things work. All of these great advancements and technologies in medicine, materials, and electronics would be hard to come by without a decent understanding of how cells, chemicals, particles, and so on function and behave!

Scientists find out things that were not known before. This is useful in several ways: first, engineers can take what scientists learn and use it to build things, and second, science is interesting in its own right. It's learning about the world.

I like your question. I read a good answer to your question in a newspaper about physics. The newspaper says scientists are helpful to us because they do useful work, like carpenters and cooks and doctors and bus drivers. Scientists do work that helps figure out how to make things like new iPads and new medicines that are fun and useful to us.

Keep asking questions!
Best wishes,

Scientists are helpful to all of us. They create new technologies to improve our health and well being. For example, a scientist discovered plastics to create containers. We use plastics in medical situations to keep items sterile (meaning very clean) and single-use so that we don't transfer diseases from one person to another. A different scientist created helpful drugs to rid bacterial diseases, so when people come down with a cold caused by bacteria, we can take medicines to get rid of those bad bacteria. Yet another scientist discovered how to vaccinate us so that we don't catch some diseases at all. You don't have to train as a scientist to be a scientist though - you just have to want to know how things work.