1. Scope:
   • Block-scoped: Variables declared with let are confined to the block in which they are declared (e.g., inside a loop or if statement).
2. Hoisting:
   • let declarations are hoisted to the top of their block, but are not initialized. Accessing them before declaration results in a ReferenceError (temporal dead zone).
3. Re-declaration:
   • let does not allow re-declaration within the same scope.
4. Global Object Property:
   • When declared globally, let variables do not become properties of the global object.