How they know abt memememe? -

How they know my name my telephone number my hp no. my address my office etc?i recieved a few emails say me meCONGRATULATIONS !!!!me have won a LOTTERY 40 million dollars FIRST PRIZEtell me collect me FIRST PRIZE LOTTERY 40 million dollarsi am curious how they know my name my telephone number my office my hp number my addreesss my office address my address my telephone number ????????/etc etc etc etc etc ???how these people know ??how these people know my everything my everything ?????

maybe you answer them back or they are pro