Concrete is great in compression, very strong stuff.
Concrete isn't so good in tension, however, so using any concrete slab in such a way that it will experience bending load - as a cantilever, for example, or a flooring slab with a long span - requires something to address that weakness in tension.
The most common solution is simple rebar...but then there's the prestressed option.
In the above video - the first in a series of twelve Shay Murtagh videos exploring prestressed concrete beams in great depth - explains what prestressed concrete is and why it's strong than just reinforced concrete.
In case you aren't aware of Shay Murtagh, they seem to be a company with at least 100 employees - many but not all of whom can line dance.
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