This Electronics Engineering Seminar Topic deals with the following:
Almost every product in the market has a barcode printed on it. Barcodes are machine-readable parallel bars that store binary information, revealing information about the product. Thus, it acts as the product fingerprint. As we go to the supermarket to buy things, the checkout person runs our selection over the scanner to scan the barcode, there’s an audible beep, and we are told how much money we owe.
But the days of barcode are numbered. The reason is that a technology called radiofrequency identification (RFID) is catching on.RFID tags are being used by corporations to track people and products in just about every industry. They transform everyday objects like cargo containers, car keys, and even clothes on the rack at a shopping mall into mini nodes on a network. Databases then record the location and status of these network nodes to determine product movements. , 
This technology can completely replace barcodes. The automotive industry makes use of small RFID tags that offer a high level of security at low cost. A lot of developments are taking place in RFID technology that will change the course of the industry, particularly in the supply chain area.
A tag is any device or label that identifies the host to which it is attached. It typically does not hinder the operation of the host or adversely affect its appearance.
The word transponder is derived from the words transmitter and responder. The tag responds to a transmitted or communicated request for the data it carries.
The transponder memory may comprise of read-only (ROM), random access (RAM), and non-volatile programmable memory for data storage depending on the type and sophistication of the device. The ROM-based memory is used to accommodate security data and the transponder operating system instructions which in conjunction with the processor or processing logic deals with the internal ‘house-keeping’ functions like response delay timing, data flow control and supply switching. The RAM-based memory is used for temporary data storage during transponder interrogation and response. The non-volatile programmable memory may be of several types of which the electrically erasable programmable read-only memory (EEPROM) is the most common. It is used to store the transponder data and needs to be non-volatile to ensure that the data is retained when the device is in its quiescent or power-saving ‘sleep’ state.