because

Because is a word that is used to explain why something happened. It can be used to give a reason or a cause.

For example, you might say "I went to the store because I needed to buy milk." This means that you went to the store because you had a reason to go, which was to buy milk.

In science, because can be used to explain why things happen in the natural world. For example, you might say "The sky is blue because of the way that sunlight interacts with the atmosphere." This means that the sky is blue because there is a scientific reason for it.

I went to the store because I needed to buy milk.