what is the meaning of core branch ? and wht makes it diffrnt from others

Core Branch is a term used for the basic engineering branches and hence the others were derived from them according to demand in market considering every sector. For example you can call Electronics, Computer Science, Electrical, Mechanical, Civil, Chemical as some of the core branches. And branch

core brach means the basic and oldest branches of engineering....there r only three core branches viz.mechanical,electrical and civil,they have evergreen importance and the job opportunies in these fields may never come to an end

Probably, these lines as quoted from wikipedia (https://en.wikipedia.org/wiki/List_of_engineering_branches) will give a better picture for all those who don't know what core engineering branches are: "Engineering is the discipline, art, and profession that applies scientific theory to design, develo