Google uses a "sandbox" or holding period for websites that are suspected of over-optimizing or link spamming in order to manipulate search rankings. The sandbox is triggered when a new site excessively optimizes on-page content like keyword stuffing titles or building too many low-quality links too quickly. Google is less tolerant of over-optimization for newer domains and in competitive industries. To avoid the sandbox, websites should focus on natural on-page optimization and link building over time rather than trying to force rankings.