Interpol is the name given to the International Criminal Police Organization, which has been set up in order to bring about the facilitation of cooperation between several different international police organizations. At the same time, Europol is basically the European Police Office, which is actually the official intelligence agency of the European Union, which includes mainly European countries such as Spain, Portugal, etc.
When Interpol started, it started as the International Criminal Police Commission in the year 1923, but the current name was adopted about thirty-two years after it started. Europol was established in the year 1999. But the organization had started on a limited scale from 1994, soon after the Maastricht Treaty of 1992.
Interpol has the constitutional power and right to go on with investigations, and they can arrest the suspects involved in the crimes if need be. Europol, on the other hand, has no constitutional right or power to conduct investigations nor question the suspects involved in various crimes.