What is Google sandbox?
Google Sandbox is a tool, filter, Google is using to find website spammers or low-value website without relevant content. Result of such action is that your site, even one or two months after your Search Engine Optimization, is not visible on the search results made by Google.
This means that Google categorized your site as not relevant or doesn't see any value or the importance of it. In that case, you need to do something about it. You need to start creating relevant and valuable content to avoid such valorization from Google.
The Google Sandbox is an alleged filter placed on new websites. The result is that a site does not receive good rankings for its most important keywords and keyword phrases. Even with good content, abundant incoming links and strong Google PageRank, a site is still adversely affected by the Sandbox effect.
The Google Sandbox Effect is a theory used to explain why newly-registered domains or domains with frequent ownership changes rank poorly in Google Search Engine Results Pages (SERPS). In other words new websites are put into a "sandbox" or a holding area and have their search ratings on hold until they can prove worthy of ranking.
The Google Sandbox refers to an alleged filter that prevents new websites from ranking in Google's top results
The Google Sandbox alludes to a supposed channel that keeps new sites from positioning in Google's top outcomes. Consider it like a probation period—regardless of whether you do everything right, your site won't get conventional rankings until it reaches an end.
The Google sandbox indicates to commonly held belief that Google has a filter that places all new websites under restrictions for a certain amount of time to avoid them from Google ranking. The idea behind the Google sandbox is that, the newer websites are not as significant as original ones; this is the idea behind the Google sandbox.