Now a days e-book is good and cheapest option to everyone for information . and e-book are cheaper than real paper books .you need a big screen tab, notebook, or pc to read e-book .we have e-book reader in our mobile phone but it’s only useful for small notification but you can’t read a book by mobile it’s really so uncomfortable to do .so the main problem is to the medium which is not available to everyone.but e-book can be a good option near feature. and if you have a pc or laptop you can buy e-book and shear it with your friends which going to be a great advantages