A prairie is known to be a type of plain. If in case you are wondering what a plain is, this is known to be a type of land that does not come with any elevation. There is also no depression. It will be flat enough.
There are times when it may come with vegetation, but there are also times when it will not come with any vegetation at all. There are a lot of people who can find the prairie and the plain confusing because they just seem to be very similar to each other.
Some people call them by their names, depending on where they come from. For example, in Canada, it is normal to call flatlands a prairie while it will be called a plain when you are in the United States.