Pub is the package manager for the Dart programming language , containing reusable libraries & packages for Flutter, AngularDart, and general Dart programs. So basically pub is the same as npm or any other package manager but it is specific to dart and flutter.
Read moreWhat is the purpose of Pubspec Yaml?
The pubspec is written in YAML, which is human readable, but be aware that white space (tabs v spaces) matters. The pubspec file specifies dependencies that the project requires, such as particular packages (and their versions), fonts, or image files .
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