Amazon Web Services plans to add 500 I.T.-focused jobs in Fairfax County and open a new office in Herndon, economic development officials there announced Wednesday.

In return, the Virginia Department of Business Assistance will offer the company money and services to help recruit and train workers. Gov. Bob McDonnell (R) approved a $500,000 grant from the Governor’s Opportunity Fund to help make the project happen.

Amazon Web Services provides businesses and government agencies with the information technology infrastructure needed for cloud computing, such as scalable databases, Web hosting, and data storage and back-up, among other services.

“Amazon Web Services is a perfect example of a company that can take full advantage of the highly skilled workforce and technology community that Fairfax County offers,” Gerald L. Gordon, the president and chief executive of the Fairfax County Economic Development Authority, said in a statement.