The position of different elements on a web page. Alignment could be focused on the page borders or the position of elements based on various other elements. For example, al the images could be aligned to the left side of the web page, and the text aligned to the right of every image.
Certain web browsers don’t display images on web pages. When this happens, the images need to have a caption/alt tag, indicating what would actually appear there. This is also a way to help search engines locate and easily index web pages.
An algorithm is essentially a set of rules utilized to rank listings contained within the index relating to specific keyword queries. Search engine algorithms are like black boxes that have a set of rules that websites are required to follow.