Update Lab-2-Create-an-image-with-ADD-instruction.md

Author: collabnix

beginners/dockerfile/Lab-2-Create-an-image-with-ADD-instruction.md

@@ -1,5 +1,11 @@
 # Lab #2: Create an image with ADD instruction
 
+COPY and ADD are both Dockerfile instructions that serve similar purposes. They let you copy files from a specific location into a Docker image.
+
+COPY takes in a src and destination. It only lets you copy in a local file or directory from your host (the machine building the Docker image) into the Docker image itself.
+
+ADD lets you do that too, but it also supports 2 other sources. First, you can use a URL instead of a local file / directory. Secondly, you can extract a tar file from the source directly into the destination.
+
 ## Pre-requisite:
 
 ## Tested Infrastructure
@@ -93,6 +99,7 @@ Please press "Enter" key twice so as to enter into container shell
 ```
 
 ADD Command lets you to add a tar directly from a link and explode to the container.
+
 ## Contributor - [Saiyam Pathak](https://www.linkedin.com/in/saiyam-pathak-97685a64/)
 
 [Lab #3: Create a Docker image with COPY instruction](https://dockerlabs.collabnix.com//beginners/dockerfile/lab4_dockerfile_copy.html)