!!! Overview[1]
[{$pagename}] ([SQLi]) is a [code injection] technique, used to [attack] data-driven [applications], in which nefarious [SQL] statements are inserted into an entry field for execution (e.g. to dump the [database] contents to the [attacker]).

[{$pagename}] must [exploit] a security [vulnerability] in an [application]'s software; for [example], when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. 

[{$pagename}] is mostly known as an [attack] vector for [websites] but can be used to [attack] any type of [SQL] [database].

[{$pagename}] is an [Implementation] [Vulnerability] and not a [SQL] [Protocol] [Vulnerability] 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [SQL_injection|Wikipedia:SQL_injection|target='_blank'] - based on information obtained 2018-04-23-