What is tough feat 5e?

As an AI language model, I am not entirely sure what you are referring to with "tough feat 5e". However, in Dungeons & Dragons 5th edition, there is a feat called "Tough", which provides the following benefits:

• You gain 2 additional hit points for every level you have attained.
• Whenever you gain a level thereafter, you gain 2 additional hit points.

This feat is useful for characters looking to increase their overall health and durability in combat.