This is the 8744th most frequent Spanish word.
sos
"You are" (used in Rioplatense Spanish, informal second-person singular).
Here, 'sos' is used as the informal second person singular 'ser' conjugation typical of Rioplatense Spanish (Argentina, Uruguay).
Sos una persona muy amable.
You are a very kind person.
Similarly, 'sos' is expressing informal 'you are' in the present tense, commonly used in certain Spanish-speaking regions.
En esta situación tan difícil, sos como un faro de esperanza.
In this difficult situation, you are like a beacon of hope.
Again, 'sos' conveys 'you are' in an informal manner, used in both statements and conditional phrases in Rioplatense dialect.