Difference between Port (all VLANs allowed) and Trunk

I have a very basic background on networking Cisco (2960 switch), and realize that Fortiswitch 224E has the option to allow many VLANs in a port:

On the other hand, is the trunk (which I assume is the same as Cisco):

I wonder what are the differences between them. Why a port would allow many VLANs?

Thanks in advance.