What this codes mean?

[Paul_Wilkins]

@iridion9

Actually, I have two lines of codes loading jquery.
That one below which is located in the body section of the script.
And another one on the head section.

So is it right to remove this codes loading the jquery on the body section of the script?

It is best to leave the line there. It is a safety mechanism that will ensure that things keep working if ever changes are made to remove the other jQuery that you are currently using.