Google sandbox

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The Google Sandbox is basically a time period that websites must wait in order to start ranking for high competitive keywords. It's a filter system that Google places on new websites which have little to no trust. There are many theories on the internet regarding the Google sandbox as it's not entirely clear, however, we do know that some sort of filter system exists which lasts between 3 to 9 months (some claim even longer). This filter system will affect highly competitive keywords and will not show them in the SERPS. What do you think about Google Sandbox?