First of all, it’s necessary to sort out what a backlink is. There is no need to explain everything in detail. The main thing to understand is what it is for and how it works. A backlink is a kind of Internet manipulator. It links one particular site with other external websites which contain links to this site. In other words, when you visit external sites they will lead you to that particular site.
Digital marketing is also referred to as 'online marketing', 'internet marketing' or 'web marketing'. The term digital marketing has grown in popularity over time. In the USA online marketing is still a popular term. In Italy, digital marketing is referred to as web marketing. Worldwide digital marketing has become the most common term, especially after the year 2013.
A Web crawler may use PageRank as one of a number of importance metrics it uses to determine which URL to visit during a crawl of the web. One of the early working papers that were used in the creation of Google is Efficient crawling through URL ordering, which discusses the use of a number of different importance metrics to determine how deeply, and how much of a site Google will crawl. PageRank is presented as one of a number of these importance metrics, though there are others listed such as the number of inbound and outbound links for a URL, and the distance from the root directory on a site to the URL.
Search engine optimization is a key part of online marketing because search is one of the primary ways that users navigate the web. In 2014, over 2.5 trillion searches were conducted worldwide across search engines such as Google, Bing, Yahoo, Baidu, and Yandex. For most websites, traffic that comes from search engines (known as "natural" or "organic" traffic) accounts for a large portion of their total traffic.