| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| io | Package io provides basic interfaces to I/O primitives. |
| log | Package log implements a simple logging package. |
| log/slog | Package slog provides structured logging, in which log records include a message, a severity level, and various other attributes expressed as key-value pairs. |
| time | Package time provides functionality for measuring and displaying time. |