Why Pump your septic tank versus just getting an inspection?

For the 3 year county inspections, what's the difference between pumping versus inspection

How does a septic system work?

What goes into a septic tank?

What is that buzzing sound?

My toilet is not flushing, what do I do?

Sewage is bubbling in my yard. What do I do?

What can I do to get ready for service