What is the main difference between "join" and "relate" in GIS?

The choice that identifies the main difference between "join" and "relate" in GIS is correct because it accurately describes how a join functions. A join combines attribute data from two tables based on a common field, creating a single table that amalgamates the information. This is particularly useful for performing analysis or visualization since it allows users to access and work with data from both tables simultaneously.

In contrast, a relate maintains the distinctiveness of each table by establishing a relationship between them without merging their data. This is beneficial when it’s important to keep the original datasets intact while still enabling users to link and query related information. Since the tables remain separate, relates require an additional step to access the related data.

The statements that imply both join and relate modify data directly in one table or that they yield identical results misrepresent the key functionalities. A join results in a different single table composed of combined data, whereas a relate keeps both tables independent.