What is the meaning of in-script and out-script in standard bitcoin transaction?

What is the meaning of in-script and out-script in standard bitcoin transaction?

I am new to bitcoin world and I am reading this paper: Secure multiparty computations on Bitcoin https://eprint.iacr.org/2013/784.pdf

The author said on page 7 that the standard bitcoin transaction can be represented as in attached picture. Could anyone explain what is meant by in-script and out-script. And Could any one give a easy explaniation to that standard transaction?enter image description here

http://bit.ly/2AntuRt

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