Backlinks are links from other websites that lead back to your website or videos. And we can say, backlinks are any link on a website/in any page that directly points ("links") back to your website or a page.But all backlinks are not the same. There are 2 types of Backlinks, High-quality backlinks and Low-quality backlinks. But your all focus should be in only high-quality backlinks. For example, you are the owner of a website and your website is about how to make money online and there is another website that is about weight loss and if that website linking back to your website about making money online then it's not going help you out too much because that website is in an irrelevant match, but there is an another website that is about making money online that linking back to your website which is also about making money online then that link is going to help you hole lot more than a website about weight loss.
Sometimes backlinks are known as connections outbound, or inbound. Generally, links to your website / page are called outbound links.
Why it is important?
Well, in the early times of the internet, search engines were very simple and only backlinks are the main option for search engines to rank the website in search engine results page (SERP). No matter how fantastic the content on a website was, how appealing the website was or what. If a sentence on a page or in a site matched a sentence somebody looked for, the page could probably be displayed in the SERPs. So backlinks are still important in 2019 for a site or page because it adds to the credibility of a website. When you will get more quality links, more trust your audience will have on you. There are many ways from you can get backlinks. Like, submit short articles to article directories, popular forums related to your niche, Social Monkee $7 one time free and by using Fiverr, etc. There are also many companies or agency who provides best seo backlink service, paid backlink service or many different types of digital marketing services. If are you thinking from where to buy backlinks for my website then firstly make sure that links should be relevant or from an authorized website.