I noticed there're 2 types of "s_vi" cookies.

[1] regular one

Name: s_vi

Value: [CS]v1|HEX-HEX[CE]

Domain: COMPANIES_NAME.122(or121).2o7.net

[2] another one

Name: s_vi_RANDOMIZED VALUE

Value: [CS]v4|HEX-HEX|RANDOMIZED VALUE[CE]

Domain: 2o7.net

What's the difference between [1] and [2]?

And, what kind of situation [2] is created on?

Thanks in advance for your help.