What are the 4 DPI levels?

Can you please elaborate on the four DPI levels that are commonly discussed in the cryptocurrency and finance industry? I'm curious to understand the significance of each level and how they impact decision-making and risk management for investors and traders. Are these DPI levels standardized across different platforms or do they vary depending on the specific cryptocurrency or trading strategy being employed? Additionally, what metrics or factors are typically considered when determining the DPI level of a particular investment or trade?