How much DPI is good quality?

Excuse me, could you please elaborate on what constitutes "good quality" DPI, or dots per inch, when it comes to digital images? Is there a specific range or threshold that is generally considered optimal for various purposes, such as printing, digital display, or even for cryptocurrency and blockchain-related graphics? Are there any industry standards or guidelines that we should be aware of when determining the appropriate DPI for our needs? Thank you for your time.