NoSQL Injection is a type of security vulnerability that occurs when an attacker manipulates queries made to a NoSQL database. Unlike traditional SQL databases, which use structured query language, NoSQL databases often use flexible data models. This flexibility can lead to improper input validation, allowing attackers to inject malicious code into database queries. When successful, a NoSQL Injection attack can result in unauthorized access to sensitive data, data manipulation, or even complete control over the database. To prevent such attacks, developers should implement proper input validation, use parameterized queries, and regularly update their database systems to address known vulnerabilities.