what is dna ?

DNA is deoxyribonucleic acid. It is located in the nuclei of cells, which make up the body.

what is light ?

Light is radiant energy. Usually referring to electromagnetic radiation.It is visible to the human eye, and is responsible for the sense of sight.

what is media ?

Media is an communication channels through which news, entertainment, education, data, or promotional messages are disseminated.

what is blogger ?

It is Google's free tool for creating blogs.We can say web-logs, are a form of online journal.

what is directory ?

Directory is a file system structure in which to store computer files

what is sem ?

SEM is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results (SERP's).Also gaining traffic by purchasing ads on search engines.

what is forum ?

It is a place, meeting, or medium where ideas and views on a particular issue can be exchanged.We can say it as message boards or bulletin boards.
where you can find additional information about your query.

what is smo ?

Social media optimization (SMO)  :
Creation of online content that is likely to be shared through social networks to generate publicity to increase the awareness of a product, brand or event.

what is crawler ?

A crawler is an program which systematically browses the World Wide Web / SERP pages in order to create an index of data.