In SEO backlink is also called by other names inlink, incoming link, inward link and inbound link. In search engine context it holds importance as it indicates importance and popularity of a web page that is an important factor in determining search engine ranking. Any link that is received by a web node (web page, directory, website, or top level domain) from another web node or a link coming to a website is considered backlink.
Avoid links to web spammers or "bad neighborhoods" on the web, as your own ranking may be affected adversely by those links
The amount of data transferred (sent to and from the server where the website is locate) on a web site or server within a specific amount of time, measured in kilobytes; would help in determining the data that can be downloaded and at what speed using the internet connection. By analyzing bandwidth you can calculate website traffic (the number of bits that are transferred on network connections). By increasing the network connection bandwidth between the website and internet you can decrease the time to download any file and avoid delay in download when number of user downloading a file increase.
A web beacon is also called web bug. It is a tracker 1 by 1 GIF (1 x 1 pixel) often invisible having no color. This line of code is placed in an ad or on a web page to track the visitor's actions, such as registrations or purchases.
It is a web site navigation in user interfaces viewed as a trail as a horizontal bar above the main content which helps the user to understand where they are on the site and how to get back to the root directory or document.
A broken link is a link that links to a web page that does not exist or has been removed to new location or has been deleted. Different reasons may be behind a broken link. There are free online tools and applications to check broken link and validate url online that would help validate link, remove bad or dead link. Broken link should be removed from the website or fixed for proper website indexing by search engines. As a result of broken link or dead link 404 error is generated.