In photography, focus is a crucial aspect that determines the clarity and sharpness of an image. When a subject is in focus, it appears sharp and detailed, while out-of-focus areas appear blurry. Achieving proper focus involves adjusting the lens to ensure the subject is sharp and well-defined. A shallow depth of field can create a pleasing blurred background, emphasizing the focused subject. On the other hand, a deep depth of field ensures that both the subject and background are in focus. Understanding focus is essential for capturing high-quality images that draw the viewer's attention.