destination	TEXT
Destination IP address
netmask	INTEGER
Netmask length
gateway	TEXT
Route gateway
source	TEXT
Route source
flags	INTEGER
Flags to describe route
interface	TEXT
Route local interface
mtu	INTEGER
Maximum Transmission Unit for the route
metric	INTEGER
Cost of route. Lowest is preferred
type	TEXT
Type of route
hopcount	INTEGER
Max hops expected

This appears to be a Layer 3 router table. Usually you have just a default route of 0.0.0.0 for IPv4 or :: for IPv6. What is cool in here that you can see is access to routes, subnets, or resources through VPN's that are on a device and how it is selecting a route. Really really useful if you are in Linux and running the machine as some form of router like pfSense or if deployed vpn's to devices and want to check if they have a route that forces connections through that. Looks like it supports OSPF and BGP given the costs as well.