How to create small window that opens from image - containing extra info, but not opening as a new page?

Hi, does anyone know how to create this feature please? I'd like to add a small window with text that gives more info about the image when you click on it (but don't want it to go to a new page) .

Thank you! 

You mean click on each image >> Show Bigger Image + Some text

Or

Click on each image >> Show a Lightbox with some text

?

(Both are possible)