Nesting in general means putting one thing inside another, but in Ignition we usually mean we are putting something into a larger version of itself. Nesting SQL queries means you will run a SQL query, then for each result that it returns, another SQL query will be run based on it. This is very useful, for example you could query all available machines, then query the work orders on those machines.
A web of connections (usually Ethernet based) between many computers and machines in a facility. Can mean a local group (LAN) or a larger group connected through the Internet (WAN).
A network drive refers to a folder stored on a computer that has been set to allow users across the network to access it. For example, you might store maintenance documents or manuals on a network drive to allow all users access to that data.
A Network Interface Controller (NIC) is a computer hardware component that connects a computer to a computer network.
.NET (pronounced 'dot net') is a software platform developed by Microsoft. There are many programming languages that all 'boil down' to .NET, for instance, C#, VB.NET, etc. In order to run a program written in a .NET language, you must have the '.NET Framework' installed on your computer. .NET is required for the old DCOM device connections (OPC-DA). FactorySQL is written in various .NET languages and runs on the .NET framework. This requirement is phasing out as more and more devices are available through OPC-UA drivers.