The Family History Library’s website has many online indexes to digital images of records. But there are more images on FamilySearch that are unindexed and online–essentially rolls of microfilm that can be viewed digitally.
The best way to find these items is to search the card catalog for the town/village, county, and state of interest and then browse through the items. Do not forget to search the catalog for all political jurisdictions into which your area of interest falls.
The catalog can be searched at: https://www.familysearch.org/search/catalog