Good morning @moruga123,
When using a vectorizer for the entire collection (without named vectors configuration), the vectorizer processes all non-skipped properties together into a single vector, representing the object in the vector space. This means they are processed as part of a single object vector.
Meaning of an object in a vector space:
However, if you choose to use named vectors, which allows for explicit configuration of different vectorizers for each property, there will be distinct vector spaces for each property. Each property gets its own vectors as a “named vector.” This configuration allows for more control and separate vector representations for different properties within an object.
Named Vectors
How to configure Named Vectors
I hope this helps! Have a great weekend ahead! 
Best regards,
Mohamed Shahin,
Weaviate Support Engineer