Repeater control is using to view the data in the format of 
table structure and it cannot able to edit the data and it 
is having Itemtemplate and Alternateitemtemplate for 
displaying the data.

According to me when u need some task to done repetedly
Repeater Control is used for exam if u r displaying sevral
product u can use it.

It is used to displaying information from datasource using
sqlcommands(Select Statement).if you have generate output
that time used to repeater control.There are several type of
templates we are using,
1.Header template
2.Item Template
3.Alternate Itemtemplate
4.Footer template
5.Separator Template

Repeater control is used to display the list of items from
the data source in a customized format. The default layout
of repeater control is Item Template. U can drag the
repeated control from toolbox menu and u can create the
controls in the html view.

1.Header template
2.Item Template
3.Alternate Itemtemplate
4.Footer template

Repeater control is used to display the data from data
source in format output like structured table.We cant modify
the data.
Five type of repeater control....
1.Header template
2.footer Template
3.Alternate Template
4.Item Template
5.Separator Template.

Repeater control used to just reads the information from
the data source and we can not edit the information.

   when you have to use this control you have must provide
the ItemTemplate, and set the DataSource property and call
the DataBind method, in order to display data in a Repeater
control.

   Repeater control have five type of template 
1.HeaderTemplate
2.ItemTemplate
3.AlternatingItemTemplate
4.SeparatorTemplate
5..FooterTemplate