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README.md

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+Multithreading in Python is achieved using the **threading** module which provides a very simple and intuitive API for spawning multiple threads.
+
+## Background on Multithreading
+Multithreading is a way off achieving multitasking, using the concept of **threads**.
+
+A *thread* is an entity, the smallest unit of processing that can be performed in an operating system, within a process that can be scheduled for execution.
+Multiple threads can exist within one process where:
+* Each thread contains its own register set and local variables (stored in a stack) 
+* All thread of a process share global variables (stored in heap) and the program code
+
+Consider the below diagrams:
+### Relationship between process & thread
+![alt text][relationship]
+
+### How multiple threads exist in memory
+![alt text][multiple]
+
+### A simple example to illustrate
+Consider the below example to illustrate the concept
+
+```
+import threading 
+
+def print_cube(num): 
+    """ 
+    function to print cube of given num 
+    """
+    print("Cube: {}".format(num * num * num)) 
+
+def print_square(num): 
+    """ 
+    function to print square of given num 
+    """
+    print("Square: {}".format(num * num)) 
+
+if __name__ == "__main__": 
+    # creating thread 
+    t1 = threading.Thread(target=print_square, args=(10,)) 
+    t2 = threading.Thread(target=print_cube, args=(10,)) 
+
+    # starting thread 1 
+    t1.start() 
+    # starting thread 2 
+    t2.start() 
+
+    # wait until thread 1 is completely executed 
+    t1.join() 
+    # wait until thread 2 is completely executed 
+    t2.join() 
+
+    # both threads completely executed 
+    print("Done!")
+```
+How the above process/program runs is illustrated using below diagram
+![alt text][program]
+
+
+[relationship]: https://cdncontribute.geeksforgeeks.org/wp-content/uploads/multithreading-python-11.png "Relationship betwen process and thread"
+[multiple]: https://cdncontribute.geeksforgeeks.org/wp-content/uploads/multithreading-python-21.png "How multiple threads exist in memory"
+[program]: https://cdncontribute.geeksforgeeks.org/wp-content/uploads/multithreading-python-4.png "How program with multithreading works"