Formatting a new partition
You can choose the format of the file system when creating a new partition, if you choose to format an existing partition, select the partition you want to format and right-click on it to open the partition menu. Then go to the format option and click on the type of filesystem you want. After selecting, apply the changes just by clicking on the apply icon in the top menu.
Disk Partitioning in Ubuntu using GParted
Disk Partitioning is a process of separating disks into one (or) more logical areas so that user and system work on them independently. When a partition is created, the disk will store the information about the location and size of partitions in the partition table. With the partition table, each partition can appear on the operating system as a logical disk, and users can read and write data on those disks. Learn more about Disk Partitioning in Linux