What is BBC Four?
{{redirect|BBC4|the BBC radio station|BBC Radio 4|its sister station|BBC Radio 4 Extra}} {{Infobox television channel | name = BBC Four | logo = BBC Four logo 2021.svg | logo_size = 200px | launch_date = {{start date and age|df=yes|2002|3|2}} | picture_format = [[1080i]] [[HDTV]]<br />{{small|(downscaled to [[16:9]] [[576i]] for the [[SDTV]] feed)}} | owner = [[BBC]] | country = United Kingdom | area = Nationwide. Also widely available in [[Switzerland]], [[Republic of Ireland|Ireland]], the [[Netherlands]] and [[United States]]. | replaced = [[BBC Knowledge]] | web = {{URL|www.bbc.co.uk/bbcfour|BBC Four}} | sister_channels = [[BBC One]]<br>[[BBC Two]]<br>[[BBC News (TV channel)|BBC News]]<br>[[BBC Parliament]]<br>[[CBBC (TV channel)|CBBC]]<br>[[CBeebies]] | terr_serv_1 = [[Freeview (UK)]] | terr_chan_1 = Channel 9 <small>(Eng, Wales, NI)</small><br>Channel 24 <small>(Scot)</small><br>Channel 106 (HD) | sat_serv_1 = [[Freesat]] (UK) | sat_chan_1 = Channel 107 (SD/HD)<br>Channel 173 (SD) | sat_serv_2 = [[Sky UK|Sky]] (UK and [[Sky Ireland|Ireland]]) | sat_chan_2 = Channel 116 (SD/HD; UK)<br>Channel 143 (SD/HD; Ireland)<br>Channel 815 (SD; UK)<br>Channel 833 (SD; Ireland) | sat_serv_4 = [[Astra 2E]] <small>([[Astra 28.2°E|28.2°E]])</small> | sat_chan_4 = 10773 H 22000 5/6 | sat_serv_5 = [[Astra 2G]] <small>([[Astra 28.2°E|28.2°E]])</small> | sat_chan_5 = 11023 H 23000 3/4 (HD) | cable_serv_1 = [[Virgin Media]] (UK and [[Virgin Media Ireland|Ireland]]) | cable_chan_1 = Channel 107 (HD; UK)<br>Channel 117 (Ireland) | cable_serv_4 = Kabeltex <small>(Netherlands)</small> | cable_chan_4 = Channel 164 | cable_serv_5 = [[UPC Switzerland]] <small>(Switzerland)</small> | cable_chan_5 = Channel 204 (HD) | iptv_serv_2 = [[Swisscom]]TV <br><small>(Switzerland)</small> | iptv_chan_2 = Channel arbitrary | iptv_chan_4 = Channel 207<br />Channel 211 (HD) | iptv_serv_4 =