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An SQL injection is a vulnerability in a website or application that allows malicious users to enter and execute malicious SQL code through input fields or URL parameters. This allows them to access sensitive information or even manipulate the entire database of the website or application.
A common way to perform an SQL injection is to enter special characters in input fields, such as single quotes or apostrophes. This allows the user's input to be interpreted and executed as SQL code, with all the consequences that entails.
To prevent SQL injections, it is important to validate user input and filter it for special characters. The use of parameterized queries can also help prevent SQL injections. By taking these measures, the security of a website or application can be strengthened and sensitive data can be protected against malicious attacks.