Service Mesh really is about connectivity among all the service you are deploying in your architecture. Some of these services are going to be databases, some o

Service Mesh really is about connectivity among all the service you are deploying in your architecture. Some of these services are going to be databases, some of them will be APIs, some of them will be caches and so on. Once you have this underlying grid of services all connecting via a service mesh - in a reliable, secure and observable way - for some of these services you want to define governance and on-boarding rules, or you want to expose them externally as products that developer can consume and you then use an API GW to do those things. In this regards, an API GW is just a service among the services you are running inside the service mesh.