Pixels and Metadata
What is a Pixel?
The word "pixel" means a picture element. Every photograph, in digital form, is made up of pixels. They are the smallest unit of information that makes up a picture. Usually round or square, they are typically arranged in a 2-dimensional grid. For example, in the picture below, you can see, when you zoom in on a photo, there are so many little tiny pixles. Pixels are controlled by binary. The image will be made up of tones of 0's and 1's telling the computer or screen what colour to produce.
Metadata
Metadata describes other data. It provides information about a certain item's content. For example, an image may include metadata that describes how large the picture is, the colour depth, the image resolution, when the image was created, and other data. A text document's metadata may contain information about how long the document is, who the author is, when the document was written, and a short summary of the document.
Web pages often include metadata in the form of meta tags. Description and keywords meta tags are commonly used to describe the Web page's content. Most search engines use this data when adding pages to their search index.
I would use metadata for going onto Facebook because it is a cloud based website.
Colour Depth and Resolution
Image resolution is the detail an image holds. So the higher the resolution, the more detailed the photo is.