Meaning and use of 'Pink Slip'

Could anyone please help me with the meaning of a Pink Slip. It is urgent.
Thanks in advance.

Dear Shubham

I am glad that you have put up this question here, as I am sure many would not know the actual facts and figures of this 'PINK SLIP'. Here's what I know about it:

'Pink Slip' is a term originated from US and became popular in mid-2000 when over 80,000 jobs were lost in one day and the nomenclature ‘pink slip’ was used. Because, that time the letter of discharge along with full and final payment to those workers/employees was handed over to them in an envelope which was Pink in colour. Thus the practice of discharging someone's services in US is known as handing over a 'Pink Slip'.

And RNS,

Sorry, Pink slip is a term given to an act by an employer and there are no other known colours as such. And more importantly, this trend of handing over Pink Slips is appropriate in US because their labour laws are not as rigid as we have in India. But in India we have been using this term out of fashion only, because terminating an employee is not that easy when you have to deal with Indian labour laws.

You can find more information on Pink Slips, Lay Offs, Sacking, etc. in the April issue of Labour Law Reporter journal.

Pink slip refers to the American practice, by a personnel department, of including a discharge notice in an employee's pay envelope to notify the worker of his or her termination of employment or layoff.[1] Receiving a "pink slip" has become a metaphor for the termination of employment in general. According to an article in The New York Times, the editors of the Random House Dictionary have dated the term to at least as early as 1910.[1] The origin of the phrase is undetermined, and there is no evidence that termination notices were ever traditionally printed on pink-colored paper.[2] In the UK and Ireland the equivalent of a pink slip is a P45, in Belgium the equivalent is known as a C4.
this is all i got to know about the pink slip through google

Pink slip refers to the American practice, by a personnel department, of including a discharge notice in an employee's pay envelope to notify the worker of his or her termination of employment or layoff.[1] Receiving a "pink slip" has become a metaphor for the termination of employment in general.
soju

pink slip means one type of Warning letter...normally 2 warning letter is required before issueing any termination letter.... but as per the company policy and situation it may be change
Regards,