Yeast display is when scientists use tiny living organisms called yeast to display different proteins on their surface. Imagine a playground where all the kids wear different colored shirts. The playground is like the yeast and the different shirts are like the proteins that can be displayed.
To do yeast display, scientists first take a piece of DNA that has the instructions for making the protein they want to display. They then stick this DNA into the yeast's genetic material.
The yeast will then use these instructions to make the protein and stick it on the surface of its cell. It's like when you use glue to stick things onto paper.
Once the protein is on the yeast's surface, scientists can study it to learn more about what the protein does and how it works. They can also use it for things like making medicines or vaccines.
So, to sum it up, yeast display is when scientists use yeast to make different proteins and stick them on the yeast's surface so they can study them and use them for different things. It's like dressing up yeast with different shirts to learn more about them.