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copied!<p>To quote the <a href="http://developer.android.com/reference/android/content/Intent.html" rel="noreferrer">API docs</a>, an <code>Intent</code> is basically a <em>passive data structure</em> holding an abstract description of <strong><em>an action to be performed</em></strong>, with two primary pieces of information, action and data.</p> <p>At the most basic level, an <code>Intent</code> can be seen as an action that you can tell Android to invoke - and what happens depends on what is registered for that action.</p> <p>The action part of an <code>Intent</code> is a string or string constant, and the data portion is a string representing a <code>URI</code>. In addition to these main attributes, you can add new attributes via an extra, which is just a map of key-value pairs.</p> <p>For more info, refer to <a href="http://developer.android.com/guide/topics/intents/intents-filters.html" rel="noreferrer">Intents and Intent Filters</a>, the <a href="http://developer.android.com/reference/android/content/Intent.html" rel="noreferrer">Intent</a> class, or <a href="http://mylifewithandroid.blogspot.com/2007/12/playing-with-intents.html" rel="noreferrer">Playing with Intents</a>.</p> <p>I also recommend the book <a href="http://apress.com/book/view/9781430215967" rel="noreferrer">Pro Android</a>, which goes into these API details at length. There is a newer version called Pro Android 2 (haven't read it).</p> <p>If you search <a href="http://books.google.com/books?id=Bam8K5SIiTkC&printsec=frontcover&dq=pro+android&hl=en&ei=quS7S9evF9HdnAfGs5DFCA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDgQ6AEwAA#v=onepage&q=intent&f=false" rel="noreferrer">Google Books for it</a>, you can see extracts of the book, look at Chapter 3, "Using Resources, Content Providers, and Intents" for more info.</p>

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