How are tags and channels related to Program

[Anonymous]

How are tags and channels related to Program 

[Anonymous]

Tags are a way of grouping your data for reporting purposes. These identifiers provide the ability to categorize data and define how you want to report on your Event, which is a type of Program, in order to understand its effectiveness and ROI.

Full reference:

http://community.marketo.com/MarketoTutorial?id=kA250000000KyrzCAC

A Channel in Marketo represents atype of marketing activity (e.g. Blog, Online Advertising, Tradeshow, Webinar, etc.) and Marketo requires that a channel type be assigned to all Programs (and Events, which are a type of Program). You have the ability to assign Progression statuses to channels and determine which Progression status triggers a Success action for a specific channel type.

Full reference:

http://community.marketo.com/MarketoTutorial?id=kA250000000KypACAS

[Anonymous]

using getChannels method we get tag types and all data. How are they related to program data and where we can view this on Marketo UI

[Anonymous]

Tags and channels are primarily used in the "Setup" tab of Programs and Events in the Marketo UI.

The article "Add & Manage Tags" referenced above features an excellent video explaining the use in details: Tagging Programs and Events

http://www.marketo.com/demo/university/marketo-tagging-programs-and-events/43_Tagging_Programs_and_E...

Trying to understand Programs, Events, Tags and Channels from the API standpoint is going to be difficult.

I would suggest learning the application fundamentals which would give you a solid foundation and a solid foundation to use the API effectively. The tutorial "Build. Test & Launch an Email Program" is definitively an excellent resource. 
http://community.marketo.com/MarketoGSWMFirstEmail