A
Red Notice is a request for the provisional arrest of an individual with a view to extradition. It includes information about the wanted person and is issued by an Interpol member country when the individual is accused of or has been convicted of a crime. This notice serves as a request to other member countries to arrest the individual and extradite them to the requesting country.
A
Diffusion is a less formal request for locating or obtaining information about an individual. It is shared directly between Interpol member countries.
The
Silver Notice is a new category of notice aimed at tracking and recovering criminal assets, such as proceeds of crime, including those from corruption, terrorism, and organized crime. The notice will support the freezing, arrest, confiscation, and return of criminal assets. A pilot program to test it is scheduled for January 2025, spanning two years. If successful, the Silver Notice will become a new tool for international asset recovery and may also allow authoritarian states to impose financial restrictions on their citizens.
Interpol also has
Blue,
Green,
Yellow,
Black,
Orange, and
Purple notices. However, for criminal prosecution, the Red Notice is typically the most relevant.
For more details on all notice types, the best explanation can be found on
Wikipedia.