Topic - Shutterstock

Shutterstock is a stock photography agency and global image marketplace headquartered in New York City. Shutterstock maintains a library of royalty-free stock photos, vectors, and illustrations available by subscription. Visitors can browse the library for free, and can license and download images through a variety of subscription packages. Shutterstock adds thousands of images to its library each day as photographers and illustrators from around the world submit their work. Each image undergoes a selection process based on quality, focus, aesthetics, artistry, and originality before being added to the collection. - Source: Wikipedia