# Glossary

• A logger is an instance that provides methods to emit logs.
• A log message is the primary string of a log. This is comparable with traditional logs.
• A logging level is the severity of a log; higher is more severe.
• A log payload is some object with additional information about the state from which the log got emitted.
• A log record is an entry that arrived at its destination (e.g. a file, a stream, ...).
• A child logger is a logger that shares some information with its parent logger (logger scope, name prefix, options).
• A transport is an instance of a class that defines the processing of logs (e.g. write to file, pass to nested transports, ...).
• A transformation is a function that prepares some payload attribute for log records (e.g. strip unnecessary information).
• A logger scope contains information that is shared between loggers and their children as long as they are supposed to be closed as a unit.