Buyout Option - Job Opportunity

Hi,
I came across an email discussing a job opportunity in which the HR concerned has asked whether Buy Out Option is applicable or not.
What could it mean regarding employment?
Kindly clarify.
Thanks in advance

Hi Arunachalam,
Buy out option means whether your notice period can be bought out or not. Every employee has to give a certain notice period when resigning from employment. When that employee is joining another company, and the company needs him/her to join immediately, they often buy out the notice period by paying one month's salary of the employee to the previous company.
Some companies allow this while other companies do not.
Regards,
Gaurang