🔹 What is DataStoreService?

• A Roblox service used to save and load player data (like money, XP, levels, items) between game sessions.
• Stores data on Roblox’s cloud servers, not locally.

🔹 How to Access

local DataStoreService = game:GetService("DataStoreService")
local myDataStore = DataStoreService:GetDataStore("PlayerData")

• GetDataStore("Name") → creates or accesses a DataStore with a unique name.
• You usually make one DataStore per system (e.g., "Coins", "Inventory").

🔹 Common Functions

1. SetAsync(key, value)

   Saves data.

   myDataStore:SetAsync("Player_123", 100)
   
   

   • Key must be a string (like "Player_"..player.UserId).
   • Value can be numbers, strings, tables (but not Instances).

2. GetAsync(key)

   Retrieves saved data.

   local coins = myDataStore:GetAsync("Player_123")
   
   

3. UpdateAsync(key, callback)

   Safely updates existing data.

   myDataStore:UpdateAsync("Player_123", function(oldValue)
       return (oldValue or 0) + 10
   end)
   
   

   • Avoids overwriting data accidentally.

4. RemoveAsync(key)

   Deletes saved data.

🔹 Best Practices

• Always use pcall around DataStore calls to prevent errors from crashing scripts.
• Limit DataStore requests (Roblox has request quotas per minute).
• Save on PlayerRemoving and game:BindToClose.