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What is computer science?
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Let's start by saying that computer science is the science of computers.
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To expand on that, computer science is defined as the study of computers and computational systems
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and deals with the theory, design, development and application of software.
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Computer science shares ties to its cousin subjects, math and physics.
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And often people interested in computer science are also passionate about math, physics or both.
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In order to study computer science.
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You need to be able to communicate with the computer.
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We do this by programming.
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Some people say programming.
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Others say coding.
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Others say development.
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All of this means the same thing.
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Writing code that the computer understands in order to perform steps to solve a problem.
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An algorithm is a step by step sequence of instructions intended at solving a problem.
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Algorithms play a huge part in computer science.
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As all developers that write code are essentially writing algorithms that the computer will execute.
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Computer science has been around since the mid nineteen hundreds and many of the problems that developers
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face repeat themselves.
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Therefore, some developers have created what are called design patterns.
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General reuseable solutions to commonly occurring problems in software design.
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In 1994, one of the most iconic books in all of computer science was published.
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Named Design Patterns Elements of reusable object oriented software.
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It was written by four great software engineers nicknamed the Gang of Four.
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Inside of this book, there are 23 design patterns which have become the core concepts for computer
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science and software engineering in the 21st century.
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And this course, you will learn all twenty three of those design patterns and how to implement them
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in C Sharp.
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How does a person communicate their intent to a computer?
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Believe it or not.
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Computers only understand two characters, zeros and ones.
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They don't know any other numbers, letters or symbols.
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Zeros and ones are called binary code.
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The language of the computer programming languages interface between us and the computer.
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We write code that then compiles down into zeros and ones before it is executed by the computer.
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There are so many programming languages out there that you can use to communicate with the computer
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and write algorithms through code that the computer can execute.
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C Sharp is one of the most popular programming languages in the world and there's the one that we will
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use in this course in the next lecture.
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We will learn what computer programming is.
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