what is a computer virus

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what is a computer virus- 
computer virus ek esa software program hota hai. jisme humari jaankari or humari permission ke bina humare computer system ko infect karne ki ability hoti hai. computer virus humare data ko transfer kar sakta hai ya humari information ko leak bhi kar sakta hai. mostly virus ka to users ko pata tak nhi chalta or virus unke computer system ko puri tarh se infect karta rhata hai. kuch he virus system ko infect karte hai. kuch ese virus bhi hote hai jo aapke system me to hote hai par ye virus aap ke system ko infect nhi karte hai. ese viruses ko system se remove karna bhi bhut easy hota hai.


How to virus infect your computer -

1.Program load hone me bhut time leta hai. memory intensive operation ki speed slow ho jati hai.

2.Disk space ka size and file size badh jata hai. kyu ki virus khud ko other files ke attached kar leta hai.

3.Directory me file names ke samne ki dates change ho jati hai. jab koi virus ek file ko modify karta hai tab operating system date stamp file ko change kar deta hai.

4.Without kisi logical reason ke floppy disk and hard disk ka suddenly access hona.

5.Abnormal write-protect errors aa jati hai. esi situation me virus kisi protected disk ko write karne ki koshish karta hai.

6.Directory listing me humai strange characters show hote hai. virus ek file ke roop me hone ka illusion humai show karte hue khud ko data area me store kar leta hai.

7.Computer screen par ya kisi document me anonymous type ke message ka show hona like- "your pc is stoned" and "wazzu".

8.Dos base virus ki vajh se humai graphic display jaise girte hue letters and ek browsers boll humai screen par show hoti hai.

9.Programs computer ko hang karte hai ya unke work ko stop kar sakte hai.

10.Junk characters document or data file ko overwrite kar sakte hai.

Types of computer virus -

1.Boot sector virus- ye virus disk ese specific area me hote hai jo ki boot time me read ya executed ki jati hai. ye floppy disk ke boot records or hard-disk ke master boot record ko infect karti hai.ye boot record program (jo ki memory me operating system ki loading ke liye jaruri hai) ko disk me overwriting kar usai change kar dete hai.
Example-form,disk killer, michelangelo and store virus.

2.File infect/program virus- Ye executable program files jaise ki .Bin, .Com, .EXE, OVl,. DRV(driver) and .SYS(system file) ko infected kar dete hai. es type ke virus execution ke time memory me load ho jate hai. ye virus khud ki bhut saari copies bana lete hai or ye disk ki files ko infect karte hai.
Example-sunday, cascade.

3.Multipartite Virus- ye boot or program virus ka ek combination hota hai. ye programs file ko infect karte hai or jab infect program ko execute kiya jata hai execute kiya jata hai. tab ye virus boot record ko infect kar dete hai. Jab hum next time computer ko boot karte hai. tab virus boot record se memory me load ho jata hai or disk par other programs ko infected kar deta hai.

4.Stealth virus- Stealth virus khud ko find hone se rokne ke liye kuch alag tarh ki strategy apnate hai. Ye disk head jisme se ye khud hote hai us sector ko read na karke ye other sector ko read kiye jane ke liye humai nirdeshit karte hai. 
Example ke liye whale virus ek infected file me 9216 bytes ko add kar deta hai. eske baad virus bytes ki esi kami ko directory me di gye size ko ghata deta hai.

5.Polymorphic virus- Ye virus ek esa virus hai. jo kisi code ko alag-alag tariko se encrypt kar sakta hai. jis se ki ye har type ke infect me different type se show ho sakta hai. es virus ko detect karna bhut muskil hota hai.

6.Macro virus- macro virus ek new type ka computer virus hai. jo kisi document or template ke macros ko ye infect karta hai. Jab hum koi koi word processing ya spreadsheet ko open karte hai tab virus activate ho jate hai. macro virus normal template ek normal use ki file jo ki default document formatting setting ko store karti hai ko infect karta hai. kyu ki ye virus khud ko document se attached kar leta hai. fir ese document kisi other computer par open kiye jate ha to ye other computers ko bhi infected kar sakta hai.
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