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+## Question 1:
+
+Output
+```bash
+Calling run()
+Running in: main
+Calling start()
+Running in: Thread-2
+```
+
+When we call `t1.run()`, we are just calling a method in the current thread(the main thread).
+No extra thread is created.
+
+But if we call `t2.start()`, the code runs in a separate thread and use multithreading.
+
+## Question 2:
+
+Output: 
+```bash
+Main thread ends.
+Daemon thread running...
+```
+
+- The main thread finishes immediately and the other thread is stopped right after because it's a daemon thread. 
+
+
+- If we remove `thread.setDaemon(true)`, the thread won't be a daemon anymore. So when the main thread finishes, the other thread will continue and the output would be :
+
+```bash
+Main thread ends.
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+Daemon thread running...
+```
+
+- Background Tasks: Tasks that shouldn’t block the application from shutting down.
+  Examples:
+  Garbage Collection: Memory management.
+  Auto-save: Periodically saving temporary drafts.
+  Monitoring/Heartbeats: Checking system health or connection status in the background.
+
+
+## Question 3: 
+
+Output:
+```bash
+Thread is running using a ...!
+```
+
+- **Syntax**: This is a Lambda Expression, a shortcut in to write code blocks (functions) concisely.
+- **Difference**: Your code is just a shorter version of the standard `implements Runnable` approach.
+You don’t need to create a separate class anymore; you just pass the logic directly as a lambda. It’s cleaner and less boilerplate code.