What is google sandbox?

The Google Sandbox effect is an alleged restriction placed on new websites. The result is that a new site does not receive good rankings for its most important keywords and keyword phrases for few months. Even with good content, many inbound links, a new website may still adversely affected by the Sandbox effect. The Google Sandbox acts as a probation for new sites, probably to discourage spam sites from rising quickly, getting banned, and repeating the process.Thus the Google Sandbox is very similar to a new website being placed on probation whose rank is kept lower than expected in searches, prior to being given full value for its inbound links and content.