The Nether Network is a network of tunnels and nether portals at level 14 in the nether, providing fast transit between places without the expense and permanence of a teleport. At the 'centre' of the Nether Network is the Nether Hub.
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The Nether Network started when fallerOfFalls dug a tunnel through the nether between their base and spawn, so that they didn't have to go by boat every time. That tunnel is now called Diagon Ally. Tunnels were then dug off Diagon Ally to other's bases. well used tunnels were expanded to be large enough for horses. Later, after the creation of the Nether Hub, mainy of the tunnels were paved with slabs to prevent Zombie Pigmen and other mobs from spawning.