Which generation iPad is the newest?

Excuse me, could you please clarify for me which generation of iPad is considered the most recent or newest one available on the market at this time? I'm trying to stay up-to-date with the latest technology and would like to ensure that I'm investing in the most current model. Is there a specific model number or name that represents the newest iPad generation, and could you provide me with some of its main features or upgrades compared to previous versions? Thank you for your help in this matter.