The Correct Answer and Explanation is:
Here is the correct answer in a single complete sentence.
An overlay is a layer of text or graphics placed on top of an image, a frame is a single still image within a video sequence, and a pixel is the smallest individual point of color that makes up a digital screen.
Explanation
The terms pixel, frame, and overlay represent three fundamental, hierarchical concepts in digital imaging and video production. Understanding them is essential for anyone working with digital media.
At the most basic level is the pixel, which is short for “picture element.” It is the smallest controllable unit of a digital image or display. Think of a digital screen as a massive grid composed of tiny, square dots. Each dot is a pixel, and it can be set to a specific color and brightness. The entire image you see on a monitor, phone, or television is created by the combination of millions of these individual pixels working together, much like a mosaic is built from tiny colored tiles. The resolution of an image or screen, such as 1920×1080, refers to the number of pixels in its grid (width by height). A higher number of pixels generally results in a sharper, more detailed image.
A frame is a complete, static image that is formed by this grid of pixels. In the context of video or animation, a frame is a single still photograph in a rapid sequence of images. Motion in a video is an illusion created by displaying these frames one after another at a high speed. This speed is measured in frames per second (fps). For example, standard film is often shot at 24 fps, while television broadcasts are typically 30 or 60 fps. Each individual frame is a complete picture built from pixels.
Finally, an overlay is an additional, separate layer of graphics or text that is placed on top of a frame or a video. Common examples include the score graphic during a sports broadcast, the name and title of a person in an interview (a “lower third”), a company logo in the corner of a video, or special effects like computer-generated fire or smoke. Overlays often use transparency (an alpha channel) so that the underlying video frame remains visible. In essence, pixels build frames, and overlays are placed on top of those frames to add information or visual flair.
