"Turtle" refers to a kind of tortoise, the scientific name of which is crocodile, which is a kind of soft-shelled turtle. They usually have a hard brown or black shell that can shrink into the protective shell to avoid danger. In China, people often refer to some reptiles as "turtles", including crocodile turtles and giant turtles.
The scientific name of "tortoise" is tortoise, which is a reptile that lives in water or half water and half land. They usually have a round or oval shell and cannot be completely retracted like hard-shelled turtles. Turtles like to live in lakes, rivers and other waters, and can also crawl and move on land.
Generally speaking, "turtle" and "turtle" are different in scientific name, appearance and living habits, but they all belong to the category of reptiles.