The most common types of bridges are the Beam and Arch Bridges.
The early bridges that were built by early man were the log bridge. That is a a log was thrown across a river to cross.
They provide a way to connect two places, locations, peoples or items. Think towns, teeth, pieces of land, languages etc.
His Head was set on a spike at London Bridge,His right leg was taken to Berwick Upon Tweed, and his left to Perth, his left arm to Stirling and his right arm hung above the bridge at Newcastle-upon-Tyne 'over the common sewer'.
After the skirmish on Lexington Common, the British army proceeded on to Concord. At the Old North Bridge in Concord, a force of milita repelled the British army and the British began to retreat back to Boston.
Thomas Paine invented an iron bridge, although "invented" might not be the correct term. A new feature of this bridge was that it had no piers supporting it in mid-river. A scale model had been created and tested, but it was never built.
computer science
Router
You may be referring to a hub or a switch. Switches are more common. Hubs are older technology.
Use Router/Firewall
Find the least common denominator.
By finding their lowest common denominator
Dissimilar fractions.
By finding the lowest common multiple of the denominators.
Find a common denominator, put the numerators in order.
analogy
There are many common communication networks in households these days. Some common communication networks in households these days includes Charter Communications and AT and T.
You can compare similar fractions by looking at their numerators. You can compare dissimilar fractions by converting them to similar fractions and looking at their numerators. You can convert a dissimilar fraction to a similar fraction by finding the least common denominator.