The Route Table, also known as the routing table, provides routing instructions and is assigned to the Subnets.
For example, when you create a VPC with network layer 10.10.0.0/16, with 2 subnets 10.10.1.0/24,10.10.2.0/24, each default subnet will be assigned a default route table.
Inside the route table there will be a route entry destination:10.10.0.0/16 target:local. This route entry shows that resources created in the same VPC can be connected to each other.