The ISSN-L, or International Standard Serial Number Link, is a unique identifier assigned to a specific title of a serial publication. It serves as a linking mechanism for different formats of the same publication, such as print and online versions. This helps libraries, publishers, and researchers easily locate and reference the same content across various platforms. The ISSN-L is part of the broader ISSN system, which includes individual ISSN numbers for each format of a serial. By using the ISSN-L, users can streamline their search processes and ensure they are accessing the correct version of a publication, enhancing the efficiency of information retrieval.