What's the meaning of uname -a ?

[sebul]

When I type uname -a I get
Linux sebul 4.9.0-6-686-pae #1 SMP Debian 4.9.82-1+deb9u2 (2018-02-21) i686
GNU/Linux

What is 4.9.0-6-686-pae ?
What is 4.9.82-1+deb9u2 ?

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