Can ESTA be extended or renewed?

At present, to be eligible for the Visa Waiver Program (VWP), you must be a citizen of a country that has been designated by the U.S. Secretary of Homeland Security, in consultation with the Secretary of State, as a “program country”.

An ESTA stands for "Electronic System for Travel Authorization" and is a system introduced by the U.S. Government to improve travel security in relation to persons entering the U.S borders. An ESTA involves providing information that will be assessed to decide whether the applicant is eligible...

Generally, your application and information are only accessed by government officials on a "need to know" basis. The information on your ESTA application is stored by the Department of Homeland Security (DHS) and they control the database with any information collected by applications.