Is it essential to write daily to keep on your writing hobby?

Yes it is important because it increases your experience in writing skills

I think most serious writers would say, yes, it is vital to try and write every day.  Luckily for us it is easier than ever to do so, here on Bayt, or just in e-mails to friends, or using other social media.

i think so keeping in practice can surely help a person to improve therefore whenever their is a plot in mind you should write and writing is mostly based on thinking of a person.

Hobby is something that we do out of our interest. When we are interested in Writing, its not essential to write every day .

If we have to practice every day writing without any interest , it can nevr be a hobby.

My own views....

While it is important to keep up-to-date with writing, it is not neccesary to write daily. If you are writing as a hobby, you will likely experience writer's block. Hence, it is not very realistic to write everyday. Nontheless, the best cure for writer's block, is to write more. 

However, if you are writting as a hobby that is your job, then it may be essential to write daily (or at least 5 times a week).

Yes, it is necessary to keep on writing to improve it and at the same time you will notice a change and improvements on day to day basis.

not, but if required to write some tasks 

When you feel from bottom of heart , you should write. Not every time when your Train/Flight got delayed you need not write :)

Yes it is essential to write daily this will help us in different ways, such as writing down a memories, as well you may find it weird but it is useful to write in our daily basis tasks, also writing down bad experiences or the negative coincidence's will help us to surpass the sadness caused by it and will help us to think positively.