Publications issued on a regular basis are periodicals. Weekly magazines, scholarly journals and newspapers are all examples of periodicals.
Serials are any periodicals, books, yearbooks, or indexes that are issued in a series.
So all periodicals are serials but all serials are not periodicals. In most UMCP Libraries, current issues of periodicals are arranged by title, in alphabetical order , in a Periodicals Room or area. Generally, earlier issues of periodicals are either bound or are available on microfilm. In most UMCP Libraries, bound volumes of periodical issues are found in the bookstacks, where they are intershelved with the books, by call number. In most libraries, microfilm collections are arranged by call number.