uAt is nothing but to get the acceptance from client

it icludes Alpha test and beta test

testing for the user acceptability of the application it is 
done by the client

UAT: testing if the software is satisfactory to the 
customer.
While doing UAT following should be satisfied.
a)functionalities are meeting business requirements or not
b)compatibilities
c)usability- how easy to use

User Acceptence Testing means one who performs actions after
deploying the appilication in the client's environment in
front of the user. And application is user friendlyness.

UAT means it get the acceptance form the client.
The client or end user will test the whole application by 
giving the different input values to check whether it is 
giving exact output or not

UAT is nothing but alpha and beta testing

in alpha testing, after completion of development and 
testing process customer will go to organization to check 
whether the application meet his requirements or not

in beta testing,after implementation  of modifications made 
by customer during alpha testing ,organization install the 
applicationat customer place and one again test the 
application.

UAT is a session where business user/s will get access to 
the developed system in a production like environment where 
business user/s can perform few critical tests and signoff 
by accepting the system met the agreed upon business 
requirments.

The system will goes to production after the UAT


-Reddy

UAT testing is usually performed by client. But we have to
prepare end to end scenarios and send it across to the
client, of course the business/service team will start
executing it.