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In this video, I'll tell you about SystemD.

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So SystemD is a manager of everything,

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and it provides three main functions in the Linux operating system.

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It's a system and service manager,

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and as such it makes sure that all the services

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that are required on the system are started.

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It's a software platform that serves as a basis

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for developing other software.

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SystemD is a platform that works with different plugins

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that provide additional functionality.

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It's also the glue between applications and the kernel,

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which provides interfaces to kernel functionality.

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SystemD offers files to start and manage services,

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as well as mounts, paths, sockets, and more.

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We call these files the unit.

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Apart from these units, SystemD also provides other functionality.

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This functionality is provided by different programs,

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like SystemD JournalD, which takes care of logging,

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or SystemD UdevD, which takes care of hardware initialization.

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There is SystemD LoginD, which takes care of session management,

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and SystemD NetworkD can be used for network configuration.

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SystemD NSpawn is for container functionality,

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and SystemD TimeSyncD offers NTP time synchronization.

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As you can see, SystemD is a rich environment

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for managing everything that happens on top of the kernel,

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and in the next couple of lessons, you'll learn all about it.