What is Go?

Go is a general-purpose compiled language created by Google engineers including Rob Pike and Ken Thompson. It emphasizes readability, fast toolchains, and practical concurrency for networked systems.

Core characteristics

• Static typing — types checked at compile time; inference with := in many cases
• Garbage collected — unlike Rust, Go uses a concurrent GC—simpler memory model, some latency trade-offs
• Goroutines — lightweight threads scheduled by the Go runtime, not OS threads per task
• Rich standard library — HTTP, JSON, crypto, testing without third-party deps for many tasks

Typical build-run flow (local)

1. Write main.go with package main and func main()
2. go run . or go build -o app then ./app
3. Deploy a single static binary—no separate runtime install on the server

Important interview questions and answers

1. Q: Is Go garbage collected?
   A: Yes—the runtime manages heap memory; you still reason about pointers and slice backing arrays.
2. Q: Who uses Go in production?
   A: Cloud platforms (Kubernetes, Docker, Terraform), fintech APIs, observability tools, and many microservice backends.
3. Q: Go vs Python for a script?
   A: Python wins rapid prototyping; Go wins typed deployment, performance, and single-binary distribution.

Self-check

1. What file extension do Go source files use?
2. Name one major open-source project written in Go.

Tip: Go source uses .go files compiled to static binaries—think single deployable artifact, not a JVM or interpreter on the server.