Telecom is about transmission of information by various technologies over wire, radio, optical, etc. It comes from human desire to communicate over distance more than that feasible by human voice.

The healthcare industry is an aggregation and integration of sectors within the economic system that provides goods and services to treat patients with curative, preventive, rehabilitative, and palliative care.

A bank is a financial institution that accepts deposits from public and creates a demand deposit, while simultaneously making loans. Lending can be done directly or indirectly through capital markets.

Financial services are the economic services provided by the finance industry, which encompasses various businesses that manage money, including credit unions, banks, etc.