Biobots, usually called ‘bots or bb’s, are nanoengineered organisms that live inside human bodies and provide internal communication links to external data networks, monitor and correct health problems, and provide targeted microdoses of manufactured pharmaceuticals.  The precursors of ‘bots were bioengineered viruses that were used for gene substitution, gene fixing, and for their bacteriaphagic properties.  Over time, the ability to design custom viruses advanced to the point that they could be made to produce and incorporate nonorganic materials, making it possible to use their electromagnetic properties to build increasingly sophisticated computer-human interfaces that completely bypassed the long-speculated stage of cybernetic implants (though the latter have found some specialized uses in data-intensive and responsiveness-critical applications). 

Today, many people literally could not live without the bb’s in the bloodstreams and almost all would find the lack of a permanent internal connection to external data nets disturbing.