No, its not an optical storage device.
That depends on your definition, but it is a storage device, it stores material on a flash memory, solid state drive.
A flash memory device such as a USB or SD card or an SSD (Solid State Storage) device
FLASH MEMORY is used in cell phones.
A solid state storage device uses solid-state memory to store data. They come in a number of different forms including hard drives, flash drives, camera SD cards, compact flash memory, etc.
A USB Flash drive is considered a storage medium. Data can be both read, stored, and sent to / from a USB Flash drive, but it does not in itself input or output any data.
Memory Stick Pro
Memory Stick is a flash memory card. It is a data storage. In some situations it can be an input device (when you load pictures from it into an image editor), in some it can be an output device (when you write edited pictures back to your Memory Stick).
Memory cards are flash storage, where data is stored in discrete transistor cells that can normally be erased or changed several thousand times.
I think it is USB Flash Drive in the field of Computers Memory Chip in the field of Cell Phone
Flash memory is a term used for solid state devices. They are called solid state because they have no moving parts and the data is "flashed" to the device. Mobile phones use flash memory, USB storage devices or even large mass storage devices can be bought as solid state.
Flash drives primarily use NAND flash memory as their storage component. This type of non-volatile memory retains data even when power is turned off, making it ideal for portable storage. Additionally, flash drives contain a USB interface controller that manages data transfer between the flash memory and the host device.