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- [Narrator] Source code refers to the lines

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of a computer program.

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Therefore, open source literally means,

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software whose source code is open to the public.

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Open source licensing allows users

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to modify or extend the existing code,

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as long as they keep its new versions, open source.

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Please note that,

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being open source isn't the same as free of charge.

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Many vendors out there

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keep some or all of their product code open source,

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but still sell their software with a price tag.

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Nessus, which is another Vulnerability Management System

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or VMS, is a good example.

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It started as an open source project

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but eventually evolved into a commercial product.

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Luckily for us, most of the software applications

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featured in this course are both open source and free.

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Open source software users need to accept

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the specific terms of a license.

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There is no restriction

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on how you use your open source software,

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but some open source licenses

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require users to release their changes

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if they modify or extend the original code.

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Others also require making the modified or extended code

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available free of charge.

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The use of open-source software

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in networking and network security is substantial.

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One such example is Linux.

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Many service providers use Linux

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to run their backend systems such as web servers

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and Base Operating Systems to host virtual machines.

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The Global Open Source Software Market is growing fast.

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Many major corporations are contributing

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to the open source community.

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Therefore, learning open source options is critical

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for students and professionals who aspire to excel

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and networking or network security.

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Open source solutions are still relevant

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even if you're not an it professional.

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If you're a home user or small business owner

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who wants to strengthen your network security

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without a hefty price tag,

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you're taking the right course.

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I'm thrilled to be your guide

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for an exciting journey throughout this course.