What does SCADA stand for and give the main features a typical SCADA package would have: Bioprocess Engineering Assignment,

What does SCADA stand for and give the main features a typical SCADA package would have.
What  is ladder logic? What is it used for, where does it live,  what did it replace, and what are the alternatives to Ladder logic ?
What do operators use SCADA for in their day-to-day jobs?
Operators send information to the SCADA, they also get information from the SCADA.  what types of info do they input to SCADA? What is this information.. commands etc.
SCADA holds lots of data, Why is it held, and what information might a SCADA package capture?
SCADA sends information to the PLC, what would a SCADA package tell a Control system to do?

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