It works with all versions of Terraria starting from v1.3 and up to the most recent version. Features include panning/zooming in any direction using either the mouse or keyboard, changing the view pitch, searching for blocks/items/ores/NPCs by name, and scrolling through a list.
Your world is never fully saved rather it is a mix of world-loaded regions that let you find what you want without needing to load the whole world.
Terraria Map lets you view the entire Terraria world map, find ores and blocks, and see where all bosses, items, NPCs, and events are in the entire Terraria world.