SQL Injection

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I know that SQL injections means finding places on a website which can be used to submit and SQL query directly in the website database, that helping you to get informations or delete table or data, or insert something. Is that a good definition of the proces? What else can you tell me about this ( with out using letmegooglethatforyou.com or google or yahoo or anyother search engine or wikipedia website as an answer ) Good day.