You can use gRPC to enable high-performance, low-latency communication between microservices. gRPC, or Google Remote Procedure Call, is an open-source remote procedure call system initially developed by Google. It uses HTTP/2 for transport, Protocol Buffers as the interface description language, and provides features such as authentication, load balancing, and more.
For inter-service communication, gRPC is a great choice because it is faster and more efficient than REST. It is also language-agnostic, meaning you can use it with any programming language that supports gRPC. ABP does not restrict you to use gRPC; you can use it just like normal .NET applications.