Please note this is not the color of eggshell it’s the shine that you would see on an egg’s shell. (I am talking about all those sheens listed in that category -Satin, Pearl, Low Sheen, Eggshell, Low Luster I am sure there are more depending on the brand of paint and how “fancy” brands want to sound!) Truth is I have seen lower sheen satins and higher sheen satins, so I don’t place a lot of value in the way some of these sheens are labelled. For example, Sherwin Williams has a low luster that is a higher sheen than an eggshell, so the name is a little misleading. Always ask to see a sample of the sheen and make sure you hold it in a way that catches the light. Most paint stores will have a strip in their fan deck of paint colors that it typically grey that will show the variation of sheen.
These paints are the most popular for walls. Typically the higher the sheen the easier to clean but that is becoming less true as paints become better and better.