Snail animal alive on a wall

We see different types of animals and these animals have a very beautiful beauty. And the beauty of every animal has been given by the Creator and has given them different characteristics. Moreover, each animal has a different structure. Today I am sharing an animal that I don't see very often. But suddenly that day I saw this animal and searched Google to find a beautiful name for this animal and the name I found is a common name and the name is Snail animal. It is a type of snail and they live mostly in water. But sometimes they are also seen on land. As I like it I have taken some pictures and the pictures are presented above for observation purpose.

When I visited my school a few days ago, I suddenly saw a snail sitting on a wall of the school. I observed from a distance and found it stuck to the wall and the snail had two body parts on either side which I could see moving. However, the structure of the snail's body seems a little strange and different to me. Its movements seemed a little strange to me at first, but later I found that it has a very beautiful beauty, and the beauty is that its body is usually inside a shell. I last saw the entire body of this snail enter the shell. But I could not take a picture of that beautiful shell.