A static route is a special route that is manually configured by the network administrator.

On a simple network, you need to configure only static routes so that the network can run normally.

A static route is a special route that is manually configured by the network administrator.
In a network with a simple structure, configuring static routes can
ensure the normal operation of the network. Setting static routes
correctly can ensure network security and guarantee bandwidth for
important applications.

The disadvantage of static routes is that they cannot change
automatically when a network fault occurs or the topology changes, and
the network administrator needs to detect and locate the fault.

The default route is used only when there is no matching route found in the routing table.

In a routing table, the default route appears as the route leading to the network 0.0.0.0 with the subnet mask 0.0.0.0.

Using the default route can shorten the time for route selection and
reduce the bandwidth resources occupied by packet forwarding, ensuring
simultaneous communication of a large number of subscribers to a certain
extent.

This document is very well done

Very good & useful doc thanks

Huawei DNS also support Default Routes.Thanks