Algorithm

  What is algorithm?

         A method that can be used by a computer for the
         solution of a problem.

         A sequence of computational steps that transform
         the input into the output.

 Basic Data Structures

• Elementary Data Structures [ PDF handouts ]
• Vectors [ PDF handouts ]
• Stacks [ PDF handouts ]
• Queues [ PDF handouts ]
• Sequences [ PDF handouts ]
• Trees [ PDF handouts ]
• Heaps [ PDF handouts ]
• Priority Queues [ PDF handouts ]
• Hash Tables [ PDF handouts ]
• Dictionaries [ PDF handouts ]

Search Trees and Skip Lists

• Binary Search Trees [ PDF handouts ]
• AVL Trees [ PDF handouts ]
• (2,4) Trees [ PDF handouts ]
• Red-Black Trees [ PDF handouts ]
• Skip Lists [ PDF handouts ]
• Splay Trees [ PDF handouts ]
• Locators [ PDF handouts ]

Sorting, Sets, and Selection

• Merge Sort [ PDF handouts ]
• Quick Sort [ PDF handouts ]
• Sorting Lower Bound [ PDF handouts ]
• Sets [ PDF handouts ]
• Radix Sort [ PDF handouts ]
• Selection [ PDF handouts ]

Fundamental Techniques

• Greedy Method [ PDF handouts ]
• Divide-and-Conquer [ PDF handouts ]
• Dynamic Programming [ PDF handouts ] 

Text Processing

• Pattern Matching [ PDF handouts ]
• Tries [ PDF handouts ]

Number Theory and Cryptography

• Numerical Algorithms [ PDF handouts ]
• FFT [ PDF handouts ]
• Cryptography [ PDF handouts ]
• RSA Encryption [ PDF handouts ]
• Information Security [ PDF handouts ]

What is Open Source?

open source refers to a program in which the source code is available to the general public for use and/or modification from its original design free of charge, i.e., open. 
Open source code is typically created as a collaborative effort in which programmers improve upon the code and share the changes within the community.

Customer Relationship Management
Sugar CRM,Splendid CRM
Target
Contact
Lead---more known to you
User----customer,staff
List
Campaign---email,phone,web
Account---can be company or customer

A library is a collection of functions / objects that serves one particular purpose. you could use a library in a variety of projects.

An API (application programming interface) is a definition ('interface') of how to work with another application, system or technology. It essentially defines the operations that are available to interact with that other system. An API can be a library (meaning that the API is wrapped in a library or set of classes), but the distinction is that an API always references an external system - whether it's a database, web service, another application, or the operating system itself.

A Framework is a larger concept - it will normally contain a number of libraries and APIs to perform common tasks. It exists on a higher conceptual level - it's not just a collection of tools, but also a collection of design patterns, best practices, and methodologies. A software Framework is an extension of a a general framework - its meanings include being a foundation from which things are built, providing support and structure, and giving guidance and definition to requirements.