IBM Security App Exchange lets users of certain security solutions pull in any threat intelligence feed that uses the open-standard STIX and TAXII formats. It can also use data to create custom rules for correlating, searching or reporting on issues. Anyone who is conversant in XML or Python will find STIX to be understandable and useful. It is intended to support both more effective analysis and the continued exchange of cyberthreat information, which can be helpful for investigating and responding to detected incidences of threat activity.”]
Source: https://securityintelligence.com/sharing-threat-information-is-easier-with-stix/