explain the purpose of an offline blog editor

Offline Blog editors like Qumana are used by bloggers to write blogs when they don't have an active internet access. These publish the blog written automatically on the internet domain when you connect to a internet connnection. They give mobility to bloggers, to write blogs and publish them later. These need to be installed on your PC and take up storage space, also save the blogs locally on your hard drive. These apps are very useful for the people who have less time for writing blogs and can do so in their spare time even without internet access.