Your question is a bit ambiguous. It seems like you're asking about the motivation behind science, rather than specific types of science. Here's a breakdown:

Science seeks to answer questions about the universe for the sake of gaining knowledge in all its branches.

Here's why:

* Curiosity: Scientists are inherently curious about the world around them. They want to understand how things work, from the smallest atom to the vast expanse of space.

* Understanding: Knowledge leads to understanding. By uncovering the secrets of the universe, we can make sense of our place in it and develop solutions to challenges we face.

* Progress: Scientific knowledge drives technological advancements and innovation in medicine, engineering, agriculture, and other fields.

However, some branches of science may have more direct practical applications than others:

* Applied science (e.g., engineering, medicine) focuses on using scientific knowledge to solve real-world problems.

* Basic science (e.g., physics, biology, chemistry) aims to understand fundamental principles and natural phenomena, even if the immediate practical applications are not always obvious.

It's important to remember that all science is ultimately about gaining knowledge. This knowledge can be used to solve problems, inspire new technologies, or simply satisfy our curiosity.