A JavaScript object that represents a value that will arrive in the future — like a receipt for pending data.
A Promise is JavaScript's way of handling operations that take time — API calls, file reads, database queries. Instead of blocking your code while waiting, a Promise says "I'll give you the result later."
A Promise has three states: pending (still waiting), fulfilled (got the result), and rejected (something failed). You handle results with .then() and errors with .catch(), or more commonly with async/await syntax which makes Promise-based code read like normal code.
Under the hood, every time you write await supabase.from('posts').select(), you're awaiting a Promise. Try/Catch blocks handle Promise rejections gracefully. Promises are the foundation of asynchronous JavaScript.
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