Kwamfutocin da aka buga, wanda kuma ake kira Printed Circuit Boards, haɗin lantarki ne don abubuwan lantarki.

Ana kiran allunan da'ira da aka buga sau da yawa a matsayin "PCB" fiye da "hudumar PCB".

Ya kasance a cikin ci gaba fiye da shekaru 100; Tsarinsa shine ƙirar shimfidar wuri; Babban fa'idar hukumar kewayawa ita ce rage girman wayoyi da kurakuran taro, haɓaka matakin sarrafa kansa da kuma samar da ƙimar aiki.

Dangane da adadin layukan daftarin tsarin, ana iya raba shi zuwa guda ɗaya, panel biyu, yadudduka huɗu, yadudduka shida da sauran yadudduka na allon kewaye.

Saboda bugu na da'ira ba kayayyakin gama gari na gama gari ba, akwai wasu ruɗani a cikin ma'anar sunan. Misali, ana amfani da allon uwa a cikin kwamfutoci na sirri ana kiran shi babban allo kuma ba za a iya kiran shi kai tsaye da da'ira ba. Duk da cewa akwai allunan kewayawa a cikin babban allon, ba iri ɗaya ba ne. Wani misali kuma: domin akwai hadeddewar abubuwan da aka ɗora a kan allon da’ira, don haka kafafen watsa labarai suna kiran ta da IC board, amma a zahiri ba daidai ba ne da bugu. Lokacin da muke magana game da allunan da’ira, yawanci muna nufin allunan da’ira waɗanda ba su da abubuwan farko.