What is the difference between basic access, administrative access and special access?

What is the difference between basic access, administrative access and special access?

Basic Access 
This type of access gives the user permission to perform specified actions on the entity records owned by the user or shared with the user. 

For example, a user with permission to Update Leads can update only the leads created by him or which are shared/reassigned to him. 


Administrative Access  

This type of access gives the user permissions to perform the specified action on all the entity records under the module on which the permission is granted. 

For example, a user with permission to Read all Leads can access/read any leads available/created in the system. 

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Special Access 

Special access is applicable only in the following modules – Lead, Contact, Company and Deal. This access gives the user privileges to add tasks/notes specific to an entity like a lead, contact, deal etc.