In broadcasting, digital subchannels are a means to transmit more than one independent program at the same time from the same digital radio or digital television station on the same radio frequency channel. This is done by using data compression techniques to reduce the size of each individual program stream, and multiplexing to combine them into a single signal. The practice is sometimes called multicasting.

ATSC-standard digital television in the United States supports multiple program streams over-the-air, using a virtual channel numbering scheme in which the television channel number is suffixed with ".2" or ".3" to indicate a second or third television program carried by the same television station at the same time. (By convention, ".1" is normally used to refer to the digital version of the station's main signal and the ".0" position is reserved for analog channels.)

For instance, an Ion Television station could use one digital signal to carry three or more subchannels in a format such as:

Andrew Jackson Young (born March 12, 1932) is an American politician, diplomat, activist and pastor from Georgia. He has served as Mayor of Atlanta, a Congressman from the 5th district, and United States Ambassador to the United Nations. He served as President of the National Council of Churches USA, was a member of the Southern Christian Leadership Conference (SCLC) during the 1960s Civil Rights Movement, and was a supporter and friend of Dr. Martin Luther King, Jr.

Since leaving political office in 1989, Young has founded or served in a large number of organizations founded on public policy, political lobbying and international relations, with a special focus on Africa.

Andrew Young was born March 12, 1932 in New Orleans, Louisiana to Daisy Fuller Young, a school teacher, and Andrew Jackson Young, Sr., a dentist. Young's father hired a professional boxer to teach Andrew and his brother how to fight, so they could defend themselves. From that, Young decided that violence was not the path he would choose to follow.^{[citation needed]}