A three-way-handshake is a method used in a TCP/IP network to create a connection between a local host/client and server. It is a three-step method that requires both the client and server to exchange SYN and ACK (acknowledgment) packets before actual data communication begins. A three-way-handshake is also known as a TCP handshake.
Pseudocode is an informal program description that does not contain code syntax or underlying technology considerations. Pseudocode summarizes a program’s steps (or flow) but excludes underlying details.
To be pseudo is to be fake. In other words, something that is pseudo is pretending that to be something it's not. Given this, the term pseudocode makes sense -- it isn't code, but it is the starting point to what the code should look like.
System designers write pseudocode to ensure that programmers understand a software project's requirements and align code accordingly. It can be anything from a few scribbles on a piece of paper, to detailed designs using a modeling language.
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