What does being schema-less mean for a NoSQL Database?

Question

Schemaless is a term that is currently floating around in the NoSql world.

1. What does this mean ?
2. I have a document with 3 properties today and I move

Answer 1

A bit late in the day but while searching on the topic again I found this article

http://tech.pro/tutorial/1189/basics-of-ravendb-nosql

Refer to section 3 in the article, I will quote it again for ease.

Adding and changing data models to RavenDB couldn't be simpler. Since it is a NoSQL database, it can handle additions and deletions to your models very simply. If a property is added to your class, it will be set to the default value of that type. If a property is deleted, then upon deserialization that value will be ignored. No more futzing with SQL Scripts.

This seems to be the logical answer for RavenDB.