Lectern

A lectern is a librarian's job site block found in villages. It is used to hold books for multiple players to read in multiplayer.

Obtaining
Lecterns can be broken with any tool, but an axe mines it the fastest.

Natural generation
Lecterns can generate in village libraries.

Usage
Lecterns hold a single book and quill or written book that other players can read at the same time. Right-clicking an empty one with a book and quill or written book places it. Right clicking a lectern with a book already occupied opens an interface to read the book. Books occupying a lectern can be retrieved through the interface or by destroying the lectern, even when /gamerule doTileDrops is false.

Redstone signal
Lecterns holding a book will emit a redstone pulse when a page is turned. A redstone comparator will also record book reading and send a signal, depending on what page the player is currently on. (e.g. a book with 15 pages will power 1 redstone level per page, or one with 5 pages will emit 3 signal strength per page.)

Changing profession
If a village has a lectern that has not been claimed by a villager, any villager has a chance to change their profession into librarian if those villagers have not already chosen a job site block.

Fuel
Lecterns can be used as fuel in furnaces to smelt 1.5 items.

Block entity
A lectern has a block entity associated with it that holds additional data about the block.