Due to the complexity, branch-specific subsets of EDIFACT have developed. These subsets of EDIFACT include only the functions relevant to specific user groups.
Example: CEFIC - Chemical industry
EDIFURN - Furniture industry
EDIGAS - Gas business

There are four major components of EDI. They are
(i) Standard document format
(ii) Translator and Mapper
(iii) Communication software
(iv) Communication network

The Electronic Data Interchange (EDI) is the exchange of business documents between one trade partner and another electronically. It is transferred through a dedicated channel or through the Internet in a predefined format without much human intervention.

(i) United Nations/Electronic Data Interchange for Administration, Commerce and Transport (UN/EDIFACT) is an international EDI - standard developed under the supervision of the United Nations.
(ii) In 1987, the UN / EDIFACT syntax rules were approved as ISO: ISO9735 standard by the International Organization for Standardization.
(iii) EDIFACT includes a set of internationally agreed standards, catalogs and guidelines for electronic exchange of structured data between independent computer systems.
(iv) It is a cross-industry, standard data format of electronic data for commercial transactions.
(v) Maintenance and further development of this standard goes through the United Nations Center for Trade Facilitation and Electronic Business (UN/CEFACT), which is affiliated to the UN Economic Commission for Europe (UNECE).

The Electronic Data Interchange (EDI) is the exchange of business documents between one trade partner and another electronically. It is used to transfer documents such as delivery notes, invoices, purchase orders, advance ship notice, functional acknowledgements etc. These documents are transferred directly from the computer of the issuing company to that of the receiving company, with great time saving and avoiding many errors of traditional on paper communications.

EDIFACT Structure:
EDIFACT is a hierarchical structure where the top level is referred to as an interchange, and lower levels contain multiple messages. The messages consist of segments, which in turn consist of composites. The final iteration is a data element.

The types of EDI were constructed based on how EDI communication connections and the conversion were organized. Thus based on the medium used for transmitting EDI documents the following are the major EDI types:
(i) Direct EDI
(ii) EDI via VAN
(iii) EDI via FTP/VPN, SFTP, FTPS
(iv) Web EDI
(v) Mobile EDI
1. Direct EDI/point-to-point : It is also called as Point-to-Point EDI. It establishes a direct connection between various business stakeholders and partners individually. This type of EDI suits to larger businesses with a lot of day to day business transactions.
2. EDI via VAN : EDI via VAN (Value Added Network) is where EDI documents are transferred with the support of third party network service providers.Many businesses prefer this network model to protect them from the updating ongoing complexities of network technologies.
3. EDI via FTP/VPN, SFTP, FTPS : When protocols like FTP/VPN, SFTP and FTPS are used to exchange of EDI based documents through the Internet or Intranet it is called as EDI via FTP/VPN, SFTP, FTPS.
4. Web EDI : Web based EDI conducts EDI using an web browser via the Internet. Here the businesses are allowed to use any browser to transfer data to their business partners.Web based EDI is easy and convenient for small and medium organizations.
5. Mobile EDI - When smartphones or other such handheld devices are used to transfer EDI documents it is called as mobile EDI.Mobile EDI applications considerably increase the speed of EDI transactions.