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iStock Photo is Getty-owned, and is one of the most well-known stock imagery sites. In order to start contributing, you will need to sign up for a free account, and submit three of your very best photos. If your photos pass the quality standards, iStock is a great place to start selling stock imagery.

Years ago, before iStockphoto came along and you wanted a stock image, there were really only a couple of reputable outfits to find what you needed.

Even then, the supply of stock images wasn't all that great, with few images, images of questionable quality, and photos that just screamed of being from a stock collection.

That all has since changed, due in no small part to iStock Photo.

iStockphoto changed the game of stock photography because it made it faster and simpler to find high-quality photos.

That improved access to stock photography came at a great time because we now live in a world in which content is king, and part of what makes content so important are the images that accompany the text.

What's more, having great photos throughout an article helps the reader. Good images can illustrate a concept or make an article look more professional. Images also serve to break up large swaths of text, which readers tend to appreciate.

Given that photos have so much power, you need to find the right images for your purposes.

iStockPhoto » Your complete creative resource for original content, with millions of photos, illustrations, videos & audio to choose from.

But in this era of creating original content, sharing on social media, and the like, you might find that you need a few more resources for finding the photos you want. Consider below list a good place to start.