Charaka Samhita is a really old book from India that talks about how to keep your body healthy. It is written in a language called Sanskrit, which is different from the language we use now.
One of the things that the book talks about is how things in our body are connected. For example, it talks about how our breath and our digestion are connected. It also talks about how different parts of our body affect each other.
The book talks about things we can do to stay healthy, including eating healthy foods and doing exercise. It also talks about how we can use plants and herbs to help our bodies.
The people who wrote Charaka Samhita were really smart and they knew a lot about medicine. Even though the book is really old, people still use it today to learn about how to stay healthy.