What is the meaning of breathing?

We need breath for life. Almost all living organisms, with the exception of viruses, need air. Some organisms absorb oxygen from the entire surface of the body. Inhabitants of the aquatic environment receive gases in dissolved form with the help of gills or other organs. We have lungs. They saturate the blood with oxygen. Without oxygen, we can live for a few minutes. Approximately 3-4 minutes without air, we will lose consciousness and an oxygen starvation of the brain will begin, which will start irreversible processes leading to the death of the body.