- [Narrator] Source code refers to the lines
of a computer program.
Therefore, open source literally means,
software whose source code is open to the public.
Open source licensing allows users
to modify or extend the existing code,
as long as they keep its new versions, open source.
Please note that,
being open source isn't the same as free of charge.
Many vendors out there
keep some or all of their product code open source,
but still sell their software with a price tag.
Nessus, which is another Vulnerability Management System
or VMS, is a good example.
It started as an open source project
but eventually evolved into a commercial product.
Luckily for us, most of the software applications
featured in this course are both open source and free.
Open source software users need to accept
the specific terms of a license.
There is no restriction
on how you use your open source software,
but some open source licenses
require users to release their changes
if they modify or extend the original code.
Others also require making the modified or extended code
available free of charge.
The use of open-source software
in networking and network security is substantial.
One such example is Linux.
Many service providers use Linux
to run their backend systems such as web servers
and Base Operating Systems to host virtual machines.
The Global Open Source Software Market is growing fast.
Many major corporations are contributing
to the open source community.
Therefore, learning open source options is critical
for students and professionals who aspire to excel
and networking or network security.
Open source solutions are still relevant
even if you're not an it professional.
If you're a home user or small business owner
who wants to strengthen your network security
without a hefty price tag,
you're taking the right course.
I'm thrilled to be your guide
for an exciting journey throughout this course.