I still don't understand data stores, can anyone help? [Unanswered]

I read the Wiki Article on Data Persistance, and Data Store. I don't understand them. I need help.

Data stores are basically where you can save small bits of information on a player such as a point value. They are commonly used for saving and loading leaderstats. I reccommend making a script that saves apon player exit. I hope I helped.

I found this from the wiki to help you. The first line says "If the player is leaving then" The second line says "If the person has a leaderstats then" The third line says "Save the number and where to find the number"

game.Players.PlayerRemoving:connect(function(player)
    if player:FindFirstChild("leaderstats") then
        player:SaveNumber(scoreKey, player.leaderstats.Score.Value)
    end
end)

Take a look at: Player Data Stores

You don't know DataStores? If you want to learn about DataStores, click here.