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You have a .go file — source code written in Go, the programming language Google designed when they got tired of C++ compilation times. Go compiles to a single static binary in seconds, handles concurrency with goroutines instead of threads, and has a standard library that covers HTTP servers, JSON parsing, cryptography, and testing out of the box.
Go was created by Robert Griesemer, Rob Pike, and Ken Thompson (co-creator of Unix and C) in 2009. Its design philosophy is aggressive simplicity — no classes, no inheritance, no generics (until Go 1.18), no exceptions. This makes Go code look repetitive but extremely readable. Docker, Kubernetes, Terraform, Hugo, and much of modern cloud infrastructure are written in Go.
VS Code with the Go extension is the standard development environment. GoLand (JetBrains, paid) is the premium option. Go includes its own formatting tool (`gofmt`), testing framework, and package manager — you rarely need third-party build tools. To run a Go file: install Go from go.dev, then `go run file.go`. The compile-to-single-binary model means deployment is copying one file.