Crime and Intelligence Analysis: Types of Intelligence Collection

There are five main ways of collecting intelligence that are often referred to as "intelligence collection disciplines" or the "INTs."​

• Human Intelligence (HUMINT) is the collection of information from human sources. 
• Signals Intelligence (SIGINT) refers to electronic transmissions that can be collected by ships, planes, ground sites, or satellites. Communications Intelligence (COMINT) is a type of SIGINT and refers to the interception of communications between two parties. 
• Imagery Intelligence (IMINT) is sometimes also referred to as photo intelligence (PHOTINT) and is related to Geospatial Intelligence (GEOINT) the analysis and visual representation of security related activities on the earth. 
• Measurement and Signatures Intelligence (MASINT) concerns weapons capabilities and industrial activities. Telemetry Intelligence (TELINT) is sometimes used to indicate data relayed by weapons during tests, while electronic intelligence (ELINT) can indicate electronic emissions picked up from modern weapons and tracking systems. Both TELINT and ELINT can be types of SIGINT and contribute to MASINT.
• Open-Source Intelligence (OSINT) refers to a broad array of information and sources that are generally available, including information obtained from the media (newspapers, radio, television, etc.), professional and academic records (papers, conferences, professional associations, etc.), and public data (government reports, demographics, hearings, speeches, etc.).

https://www.fbi.gov/about/leadership-and-structure/intelligence-branch