Generally speaking, a dictionary was available in book form before and they are a mere collection of different English words that are listed in alphabetical orders with definitions and pronunciations. Some used dictionary so they will be effective in their writing and communication skills.
One advantage of an online dictionary is convenience. Being able to access it anywhere and anytime is a great advantage to anyone who works as a writer, students and those are who are always dealing with communication and documents.
The second reason why you should get an online dictionary app is that because it is cost effective. Compared to the dictionary in book form, dictionary app is available online for free. So you don’t have to spend a lot just to own a dictionary.
The most important reason why you need to get an online dictionary app is to be able to get new updates. The language changes every now and this makes the updates very important. Examples of words added are slang words that evolve and become a part of the dialect. These words do not show up in printed dictionaries that are older.
So instead of having to buy new dictionaries every year to keep up with the new updates and new words added to the vernacular, getting an online app is more efficient and cheaper.