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Your question is very general and we will need more info to know exactly what you are looking for, but here is a link to all standard controller methods for an ApexPage.
https://www.salesforce.com/docs/developer/pages/Content/apex_ApexPages_StandardController_methods.htm (https://www.salesforce.com/docs/developer/pages/Content/apex_ApexPages_StandardController_methods.htm" target="_blank)
When the standard DELETE button is called, basically it just performs a Database.delete(); DML operation on the specified record or collection of records.