The tactics within the matrix only show attackers' objectives without detailing their methods. Techniques and sub-techniques, however, demonstrate the specific methods attackers use to achieve their goals and execute attacks. Each technique/sub-technique is categorized within the matrix under a particular tactic. As an example, some of the techniques on the enterprise matrix are shown in the image below:
(Image Source: mitre.org)
Majority of the Most areas in the matrix above represent techniques. Some techniques have sub-techniques, while others do not.
As shown in the image, gray areas next to technique names in the matrix indicate that the technique has sub-techniques. Let's examine the sub-techniques of the first 4 techniques under the "Reconnaissance" tactic:
(Image Source: mitre.org)
Techniques are divided into 3 groups according to matrices:
Enterprise techniques are numerous and regularly updated. As of 10.05.2023, the numbers are:
Techniques: 193
Sub-techniques: 401
You can check the current numbers at the link below:
Enterprise Techniques and Sub-techniques: https://attack.mitre.org/techniques/enterprise/