Say a laundry company:
They might have public sector clients: Government run hospitals
private sector Hotels
residential sector You and your squeeze
Industry sector is a category of businesses (industry) like metal businesses, oil businesses, financial businesses, etc.
1. The airline industry 2. Lodging Companies 3. Travel Agencies 4. Cruise Lines 5. Motor Coach Operations 6. Tour Operations 7. Food services 8. Car Rentals 9. Rail Travel 10. Meetings &...
If you're talking about industrial sectors then i believe that the company 'Sports Direct' falls under the tertiary sector.
Defense and Aerospace
an industrial sector that heavily relies on manual labour and craft skills. This sector has existed for centuries.