Acomputerisanelectronicdevice,whichexecutessoftwareprograms.Itconsistsof2parts-hardwareandsoftware.Thecomputerprocessesinputthroughinputdeviceslikemouseandkeyboard.Thecomputerdisplaysoutputthroughoutputdeviceslikecolormonitorandprinter.Thesizeofacomputervariesconsiderablyfromverysmalltoverybig.Thespeedofcomputersalsohasaverylargerange.Computershavebecomeindispensableintoday’sworld.Millionsofpeopleusecomputersallovertheworld.

　　Thereareseveralusesofcomputers:-

　　WordProcessing-WordProcessingsoftwareautomaticallycorrectsspellingandgrammarmistakes.Ifthecontentofadocumentrepeatsyoudon’thavetotypeiteachtime.Youcanusethecopyandpastefeatures.Youcanprintoutdocumentsandmakeseveralcopies.Itiseasiertoreadaword-processeddocumentthanahandwrittenone.Youcanaddimagestoyourdocument.

　　Internet-Itisanetworkofalmostallthecomputersintheworld.Youcanbrowsethroughmuchmoreinformationthanyoucoulddoinalibrary.Thatisbecausecomputerscanstoreenormousamountsofinformation.Youalsohaveveryfastandconvenientaccesstoinformation.ThroughE-Mailyoucancommunicatewithapersonsittingthousandsofmilesawayinseconds.Thereischatsoftwarethatenablesonetochatwithanotherpersononareal-timebasis.Videoconferencingtoolsarebecomingreadilyavailabletothecommonman.

　　Digitalvideooraudiocomposition–Audioorvideocompositionandeditinghavebeenmademucheasierbycomputers.Itnolongercoststhousandsofdollarsofequipmenttocomposemusicormakeafilm.Graphicsengineerscanusecomputerstogenerateshortorfull-lengthfilmsoreventocreatethree-dimensionalmodels.Anybodyowningacomputercannowenterthefieldofmediaproduction.Specialeffectsinsciencefictionandactionmoviesarecreatedusingcomputers.

　　Desktoppublishing-Withdesktoppublishing,youcancreatepagelayoutsforentirebooksonyourpersonalcomputer.

　　ComputersinMedicine-Youcandiagnosediseases.Youcanlearnthecures.Softwareisusedinmagneticresonanceimagingtoexaminetheinternalorgansofthehumanbody.Softwareisusedforperformingsurgery.Computersareusedtostorepatientdata.

　　MathematicalCalculations-Thankstocomputers,whichhavecomputingspeedsofoveramillioncalculationspersecondwecanperformthebiggestofmathematicalcalculations.

　　Banks-Allfinancialtransactionsaredonebycomputersoftware.Theyprovidesecurity,speedandconvenience.

　　Travel-Onecanbookairticketsorrailwayticketsandmakehotelreservationsonline.

　　Telecommunications-Softwareiswidelyusedhere.Alsoallmobilephoneshavesoftwareembeddedinthem.

　　Defense-Thereissoftwareembeddedinalmosteveryweapon.Softwareisusedforcontrollingtheflightandtargetinginballisticmissiles.Softwareisusedtocontrolaccesstoatomicbombs.

　　E-Learning–InsteadofabookitiseasiertolearnfromanE-learningsoftware.

　　Gambling-Youcangambleonlineinsteadofgoingtoacasino.

　　Examinations-Youcangiveonlineexamsandgetinstantresults.Youcancheckyourexaminationresultsonline.

　　ComputersinBusiness-Shopsandsupermarketsusesoftware,whichcalculatethebills.Taxescanbecalculatedandpaidonline.Accountingisdoneusin