Hi Santhoshreddy,

Salesforce’s different user licenses give users different access to your data.  (The license type determines which profiles and permission sets are available to the user.)

To view a list of the active user licenses in your Salesforce org,  click Your Name | Setup | Company Profile | Company Information

Here’s the summary of Salesforce user license types:

Salesforce
Full access to standard CRM, custom apps, and AppExchange apps.
Salesforce Platform
Custom apps & core objects (Accounts, Contacts, etc) only; no CRM (no Opportunities or Forecasts).
Force.com – One App
One custom app & read-only for accounts and Contacts; no CRM.
Knowledge Only User
Salesforce Knowledge app only.
Chatter Free
Access to Chatter for people in your company without a Salesforce license.  No additional cost.
Chatter External
Allows your customers to use Chatter groups.  No additional cost.
Chatter Only (aka Chatter Plus)
Access to Chatter for people in your company without a Salesforce license PLUS access to accounts & contacts.  Additional cost.
Guest User
Create a public website for your organization using Force.com Sites.
Gold Partner
Partner portal access.
Authenticated Website
A type of high volume customer portal license used with Force.com Sites. A modest fee allows for a certain number of logins per month to your portal/website.
High Volume Customer Portal
Unlimited logins to your Service Cloud Portal to access customer support information.
Customer Portal Manager Standard
Contacts can log into your Customer Portal to manage customer support.
Customer Portal Manager Custom
Contacts can log into your Customer Portal to manage customer support (with more access than Customer Portal Manager Standard).

https://help.salesforce.com/HTViewHelpDoc?id=users_understanding_license_types.htm&language=en_US

Profile:  A profile contains user permissions and access settings that control what users can do within their organization.

http://help.salesforce.com/HTViewHelpDoc?id=admin_userprofiles.htm
Please let me know if the above information was helpful

Please refer the link below for reference.

• https://help.salesforce.com/articleView?id=users_license_types_available.htm&type=0
• https://salesforce.stackexchange.com/questions/4087/what-is-the-difference-between-salesforce-license-and-edition

Best Regards
Rahul Kumar