Structured Query Language (SQL) injection
1. A computer code injection technique that allows malicious code to be injected or inserted into database entry fields, enabling attackers to gain control over the database contents.
Source: Guide to Cybersecurity as Risk Management: The Role of Elected Officials, Governing Institute, CGI, https://www.cgi.com/sites/default/files/2019-03/guide_to_cybersecurity_as_risk_management_the_role_of_elected_officials_0.pdf
2. An attack technique that attempts to subvert the relationship between a webpage and its supporting database, typically in order to trick the database into executing malicious code.
Source: The State and Local Election Cybersecurity Playbook, Defending Digital Democracy Project, Harvard Kennedy School Belfer Center for Science and International Affairs, https://www.belfercenter.org/sites/default/files/files/publication/StateLocalPlaybook%201.1.pdf