Sectional title surveys are relatively new in the history of survey in South Africa and with the promulgation of the Sectional Titles Act (Act 95 of 1986), it became possible for parts, or sections, of a building to be separately owned by individual owners. Ownership of a section is a real right and the benefit thereof is the same as ownership of land.
The creation of sectional titles schemes and section plans is reserved exclusively for registered Sectional Title Practitioners.
Historically flats in buildings were owned as shares in a share block scheme. In this scheme owners do not actually own the flat, but rather a share in the company that owns the entire building. The implications is that the share an individual owns is not a real right and cannot be registered in the deeds office.
A comprehensive article and comparison between shareblock vs sectional title can be found here