What is the difference between discount and bargain ?Feel free to just provide example sentences.

A discount is an amount subtracted from the price of an item.
If a shirt cost $10, and had a $2 discount, the shirt would cost $8.
If a shirt cost $10, and had a 50% discount (you can say, "half off"), the shirt would cost $5.
A bargain is any price that is better than average. "At the shop over there, a hammer costs $8, but at this shop, the hammer costs $5. It's a bargain!"
There are other meanings for both of these words, but this is the main difference.
Bargain and discount are both used to describe stores with low prices. "John's Discount Shoe Store" "Greenville Bargain Bags"