What is meant by social security?

Plz give a little long answer.

Social Protection is insurance. Workers pay this insureance, usually by withdrawing salaries where they work. Per year they can earn as many as four credits.  For 2020, every time anyone receives $1,410, they receive one credit before they reach $5,640, or four credits.2 The money goes into two trust funds for Social Security — the OASI Trust Fund for Retreates

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