Distinguish between data and signal.

Data is an entity, which conveys some meaning. On the other hand, the signal is a representation of data in some electric, electromagnetic or optical form. So, whenever data needs to be sent, it has to be converted into signal of some form for transmission over a suitable medium.

Multithreading

Visual Basic .Net provides full support for creating multithreaded applications. Multithreading enables an application to contain one or more threads that can share the workload in an application by executing one at a time.