An import filter is a piece of software that translates references, downloaded from a bibliographic database into a format that EndNote can understand. The filter tells EndNote where information must be placed: authors in author field, title in title field, etc. With import filters EndNote can place references uniformly.
Steps for importing text files (RIS or other output formats) in EndNote:
See information about importing files from PubMed, Web of Science, EBSCO databases and ProQuest.
EndNote comes preloaded with many filters. If the import filter is not in the manager list, you can download it from the EndNote Website.
Steps for Adding Import Filters to EndNote