What are the different levels of Shimano MTB derailleurs available?

Shimano offers a range of MTB derailleurs with varying levels of performance and features. These include entry-level derailleurs like the Tourney series, mid-range options like the Deore and SLX series, and high-end models like the XT and XTR series. Each level offers different levels of durability, precision, and smooth shifting performance to suit different riding needs and budgets.