Quick answer
For SEO and customer communication, it is useful to use both terms: sectional title insurance for the technical category and body corporate insurance for the way many trustees, owners and managing agents search.
What sectional title insurance refers to
Sectional title insurance generally refers to insurance for the buildings and common property in a sectional title scheme, usually arranged at body corporate level.
What body corporate insurance refers to
Body corporate insurance is the practical term many customers use when they are asking about the scheme’s building insurance, claims, excesses, renewals and trustee decisions.
What owners still need to insure
Owners should not assume the scheme policy covers contents, personal belongings, portable items or all internal improvements. Those may need separate personal cover.
How trustees should explain it
A simple explanation is: the body corporate arranges scheme-level building and common property insurance, while each owner should check their own contents and personal insurance needs.