Buying a new domain name is one of the first steps that you need to take for building a website or blog. In the recent updates of Google's search algorithm, importance of the wording of a domain name has significantly decreased. But it does not mean that you should not do a history check before buying a new domain name. If you thought of a great domain name and you found it available on the registrar's website, it does not mean that the domain has no history associated with it. The same domain could have been previously owned by a different person or organization. And they could be running some sort of website on that domain name.
As you may know, most of the Internet is filled with useless stuff. Google penalize websites that host low quality content. This penalty basically means that the search ranking of the said website will go down. If the domain you're about to buy was hosting low quality content in the past then you're running the risk of buying a domain with a penalty associated with it. This is not at all a good idea and you should avoid such domain names.
TechWelkin Domain Age Checker Tool helps you by finding the age of a given domain name. If age turns out to be zero, that means that this domain is totally fresh and has never been owned by anyone else. You can safely buy such domains. But if a domain name is aged, you should look into the content that was hosted on it previously. Looking at the content will help you decide if you really want to buy this domain.