[1] ETSI supports the development and testing of global technical standards for ICT-enabled systems, applications and services.

The role of the ESOs is to support EU regulation and policies through the production of harmonised European Standards (ENs) and other deliverables.

[citation needed] ETSI develops standards in key global technologies such as: GSM, TETRA, 3G, 4G, 5G, DECT.

[citation needed] ETSI's standardization activities are organized around sectors: Home & Office, Better Living with ICT, Content Delivery, Networks, Wireless Systems, Transportation, Connecting Things, Interoperability, Public Safety and Security.

Small and Medium Enterprises (SMEs) and Micro-Enterprises (MEs) represent more than a quarter of ETSI's total membership.