Relations are very useful if you want to connect your data. Imagine you have Customers and you want to connect Customers to Features, Purchase Orders, Invoices, Requests, Issues, etc. Some of these Databases are in different Spaces, so it is very handy to use Relations to reduce data duplication.
Take a look at these Spaces:
Every arrow is a relation. For example, Project connected to Tasks and Meetings, it means inside every Project you will see a collection of Tasks and Meetings:
Connect Databases / Add new Relation
You can add new Relations from any Database. Navigate to Database setup and find Relations menu item. Let's connect Project to Meeting. Every Project will have many Meetings:
Fibery supports all kind of relations: