Okay, so imagine you have some straws. These straws can be made out of different materials, like plastic or paper.
Now, the straws that we call MS pipes and MS tubes are made out of a material called mild steel. It's a type of metal that is strong and durable, but it's not too heavy or expensive.
The difference between a pipe and a tube is basically just the shape. A pipe is usually round and hollow on the inside, while a tube can have different shapes like square, rectangular, or even oval.
MS pipes and tubes are used for lots of things, like building structures and transportation systems (like cars and trains). They're also used for things like water pipes and gas lines.
So, just remember that an MS pipe or tube is a strong and durable straw made out of mild steel, and they can be used for lots of different things!