What is Minecraft Indev?

Today I was watching a video of iDeactiveMC and found out that there is a old version of Minecraft called Minecraft Indev.

Please explain me exactly what Minecraft Indev is?

minecraft-java-edition terminology

Pictures about "What is Minecraft Indev?"

What is Minecraft Indev? - What Text on a Pink Surface

What is Minecraft Indev? - Interior of modern office lounge zone with sofa and armchair with table near window next to TV on wall and neon signboard with text do what you love near door

Can you get Minecraft Indev?

The Indev house has now been removed.

Is the Indev house still in Minecraft?

Minecraft Interactive Experience Infdev (short for infinite development) was the fourth phase in the development cycle of Minecraft and is only playable in single-player Survival mode, and was the third Minecraft development stage to have some of its versions released to the public.