A frequently asked question in the painting world is what is the difference between paint and stain? There is a big difference between them and even times when one is better than the other to use. Il break it down simply for you so if you ever find yourself wondering what product to use, you'll be able to make an educated decision. When it comes to interior work you will mostly be using paint. However, when you start getting into the high-end wood furniture, furnishings, and custom woodwork you'll probably be using stain and sealers. Sometimes the choice is obvious on what to use but people have different tastes and visions of what they want the final product to look like.
Paint is meant to cover, coat, protect, and color the wood. Essentially it sits on the surface. Stain on the other hand is also meant to coat, color and protect the surface but it does this by penetrating and being absorbed by the wood. Depending on the quality of product you use, you can also seal the wood. This will make it more resistant to moisture. Typically oil based stains last longer and need fewer coats then water-based products. These are the main differences between the two. Another obvious difference would be the amount of pigment in each type of product.
Paint is meant to cover the surface completely, so you cover what was underneath. Stain on the other hand is meant to coat the wood yet still show the surface underneath. Paint has sheen options such as flat, eggshell, satin and semi-gloss. Stain also has options but rather than sheen it's a transparency option. Examples would be transparent, semitransparent, semi solid or solid. Overall stain will protect the wood better because it is absorbed however it does require more frequent maintenance if its outside. You can expect to touch things up about every 18-24 months with stain. Paint not so much. Stain is easier to touch up as well.
These are a few things to keep on mind when deciding if you're going to paint or stain. In my experience Stain is ideal for fences, decks and any outdoor furnishing. Because stain is absorbed into the wood unlike paint, it works great for these areas considering they tend to see just as much if not more sun than the siding. Also, any areas that may accumulate standing water or get wet often such as a deck or a fence will benefit from stain over paint. In these same situations overtime paint will start to chip or peel, and the moisture will be absorbed by the wood. This is how you get rotted wood and mold and mildew to start to form. With some maintenance and the right knowledge this is easily avoidable. Next time you're wondering if you should use paint or stain, ask yourself these questions. Will the area/object be inside or outside? Where will it be, next to a window, in the living room or in the middle of your yard exposed to the sun and elements? Solid color or transparent? Do you want to see the wood grain or cover something up? Will it get wet often? Do this and you will find out what product is right for you for that project. All that being said in reality it comes down to your personal preference.