A closure is a first-class function that refers to (closes over) variables from the scope in which it was defined. If the closure still exists after its defining scope ends, the variables it closes over will continue to exist as well.

web.config is an XML file that stores the main settings and configuration files for an IIS server.

GENERAL VAGRANT SUPPORT IS OFF-TOPIC. Support questions may be asked on https://superuser.com. Vagrant is a command line tool for provisioning virtualized environments on top of various providers, including VirtualBox, VMware and AWS.

WebRTC is a free, open project providing browsers and mobile applications with Real-Time Communications (RTC) capabilities (audio, video, and binary data streaming) via simple APIs and common set of protocols. Tags for operating environment may be helpful, e.g. [node.js] or [reactjs] or [ios] as well as specific browser, e.g. [firefox]. Questions concerning Session Description Protocol use [sdp]. Use [ortc] for Object RTC.

Jinja2 is a fast template engine for Python. It has full Unicode support, auto-escaping, inheritance, macros, and many other features.

Windows Internet Explorer 8 is a web browser developed by Microsoft, released on 19 March 2009 for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, and Windows 7.

For SharePoint-specific questions, please see the SharePoint Stack Exchange site at https://sharepoint.stackexchange.com/

Seaborn is a Python data visualization library based on matplotlib. It provides a high-level interface for drawing attractive and informative statistical graphics.

The interface to a program that consists entirely of text, as opposed to (although not necessarily mutually exclusive to) a GUI, or Graphical User Interface.

JTable is a Java Swing component used to display and edit regular two-dimensional tables of cells.

Locking allows different types of resources to be used exclusively by one process at a time.