Mammograms and breast ultrasounds are considered the two common techniques: 

Mammogram

Is a widely known method for breast cancer screening. During the mammography, the doctor takes images of the breasts with the help of an X-ray to detect abnormalities before the tumor or any lump appears. 

Breast Ultrasound

Another technique used for breast cancer screening is breast ultrasound. During this procedure, the device uses sound waves to get images of breast tissues. It is a safe option for women as there is no radiation involved.