security contracting; private security service
Refers to the business of providing contracted security services, such as guarding buildings, patrolling, or monitoring against fire and theft. Often used in company names.
Security for this building is contracted out to a specialist company.
A security company monitors the premises around the clock.
警備 means 'security' or 'guarding' in general, while 警備保障 specifically refers to the business or contractual service of providing security.
セキュリティ is a broader loanword for 'security' (including IT security), whereas 警備保障 is limited to physical security services.
security firm; security company
Compound of 警備 (security, guarding) and 保障 (guarantee, assurance), literally 'security assurance'. The term is used primarily in business contexts for contracted security services.