Databases in their simplest form are lists of records of repeating information. Typically a CLC will have lots of lists like this in paper form, in spreadsheets or in MS Word. And a common use for this is to send bulk mail or mail merges etc.
Keeping data of this sort in these forms is problematic. It doesn't scale up, its not shared, lots of work gets repeated. data may be correct in one list and incorrect in another. staff maybe unaware of each others lists etc, etc. This situation NEVER improves.
Microsoft Access and Filemaker are programs made to create databases and properly done they avoid the problems listed above and bring other benefits.
Developing a database is beyond the skills or time constraints of most CLC staff.
Having said this CLCs that have more than about 6 would benefit from a Contacts database that aggregates the various list throughout the office and provides a consistent means for creating labels, merges, lists, reports and bulk email.
They usually require a bit of customisation but Filemaker and Access developers usually have developed similar things many times, so they can be acquired fairly cheaply.
Contact databases are discussed in more detail in the Information Management Section of this site.
NB. The CLSIS casework database is discussed in another part of this site.