What do we mean by matrimony fraud ? How to protect ?

After they post an impressive online profile on a matrimonial site, posing as prospective bridegroom or bride, fraudsters befriend women/men. They use different online tools like voice-changing apps to pose as the parents or relatives of the bridegroom/bride,most of the time the voice used is of females,to give safe feel.when talking to the women/men, they tryto con. Once they gain confidence, the fraudsters ask women/man use different mode of con,like to transfer money into their bank accounts stating an emergency..sometime they want to meet for more confidence or creating a big scam,they gain your emotions and interact with your telling that they got a brighter business or job offer,they take money,scaming you by showing a visual of brighter future with that job.After finance transaction they disappear without a trace as soon the money is transferred and the cycle continues
 Measure to be taken to prevent from such people :
Never give your financial information, such as Credit Card number, to people you befriend on the internet.
You need to check criminal background check of the person.
Choose public places for meetings.
Requests to send money to be ignored and report the matter to authorities immediately.
Keep your friends or family informed about where and who you are meeting.
Beware of a person who quickly asks to contact from a different email ID or messaging service, asks for your address, etc.