Firstly the Pattern Book is a collection containing editable Illustrator Patterns. For example the Pattern’s colors can be changed. As a result use the Pattern as a design resource. Similarly use the Pattern download as a stand alone composition. That is to say they are customizable digital patterns.
Browse the 
Free Pattern Collection.
 
After that find the right Pattern to download. Above all use the 
Free Pattern
 
in your personal or commercial projects at No Cost! 
In short visit the 
Pattern Collection
 
or the 
Collection Book
 
for Free Design Resources. For Illustrator help visit Illustrator Guide.
