Ellis Island is located in New York harbor and was a major entry point into the United States during it time of operation. The Island was used from 1892 to 1954. This covers a major immigration peak in US history. By no means the only port of entry during this time it was the most popular. It was set up to handle large amounts of people.
This site was created as a result of funding drive that occurred in the early 1980's and was headed up by Lee Iaccoca. It was two fold in creating this database and improving the physical structure of it's buildings.
Similar to the Castle Garden site be sure to use wild cards when doing your searches. Quality of hand writing can vary and the interpretation of the transcriber can also lead to challenges. Still and excellent place to locate your ancestors if they came to our country during that time period. The website is www.ellisisland.org.