Simple ppt to get the overview of google app engine...

2. •Apps is an abbreviation for application. An app is a
piece of software. It can run on the Internet, on your
computer, or on your phone or other electronic
device.
• Google refers to their online services as apps, but
they also sell a specific suite of services known as
Google Apps and have an application hosting
service called Google App engine.

3.  Google App Engine is a platform for writing your own Web
applications and have them hosted on Google servers.
 Currently the supported programming languages are Python, and Java.
 Google Apps can be found on the Web at www.google.com/a
 And Google App Engine can be found on the Web at
code.google.com/appengine.
 You can serve your app using a free name on the appspot.com
domain. You can share your application with the world, or limit
access to members of your organization.

5.  App Engine shares resources among multiple applications,
but isolates the data and security between each tenant as
well.
 Your application is able to use some of the Google services,
like URL Fetch, to execute processes on its behalf.
 Because you can't open ports directly within your
application, you have to rely on this service, for example, to
request Google to open a port and execute the fetch on a
URL for the application.

6.  Easy to get started
 Simple app configuration
 Automatic Scalability
 Reliability
 Security

7.  . With App Engine you write your application code, test it on your
local machine and upload it to Google with a simple click of a
button or command line script.
 Once your application is uploaded to Google , then google host
and scale your application.
 The app engine takes care of all the maintenance so you can
focus on features for your users.
 You can create an account and publish an application that people
can use right away at no charge from Google. When you need to
use more resources, you can enable billing and allocate your
budget according to your needs.

8.  Each App Engine application can consume a certain level of
computing resources for free, controlled by a set of limits(eg,
Google App Engine requires a Google account to get started, and
an account may allow the developer to register up to 10
applications.)
 Developers who need resources above these free limits can switch
to a paid app using Google Checkout to set a daily resource
budget.

9.  When you convert to a paid app you will spend a minimum
of $2.10/week. This allows you to purchase additional
resources when needed.
 App Engine will always be free to get started, and after
you've created a paid app, all usage up to the free limits will
remain free.

10.  Automatic scaling is built-in with App Engine.
 Your applications can take advantage of the same scalable
technologies that Google applications are built on.
 All you have to do is write your application code and the
app engine does the rest. No matter how many users you
have or how much data your application stores, App Engine
can automatically scale to meet your needs.

11.  The same security, privacy and data protection policies we have
for Google's applications applies to all App Engine applications.
 There are measures to protect your code and application data.
 The Secure Data Connector (SDC) ensures that private data is
securely accessible to your Google App Engine application.

12. Limit resource usage
 Limit 1000 files per app, each at most 1MB
 Hard time limit of 10 seconds per request
 Most requests must use less than 300 msec CPU time
 Hard limit of 1MB on request/response size, API call size, etc.
 Quota system for number of requests, API calls, emails sent, etc

13.  Developers have read-only access to the filesystem on App Engine.
 App Engine can only execute code called from an HTTP request
 Does not support 'naked' domains (without www) like
http://example.com.
 A process started on the server to answer a request can't last more
than 60 seconds.