OFDM is a multi-carrier transmission technique. It converts the frequency selective fading channel into a collection of parallel flat fading sub-channels which simplifies the structure of a receiver. OFDM has been widely used in communication system and is the key technology of 4G in the field of mobile communication because of its excellent performance in overcoming multipath channel and narrow band interference. However, wireless environment causes ISI and ICI. Synchronization is one of the major problems that affect the system performance in OFDM system. We basically focus on symbol timing. Finding the symbol timing for OFDM means finding an estimate of where the symbol starts. OFDM requires timing synchronization to preserve the orthogonality. The receiver will obtain the timing information from the received OFDM signal, but the information obtained comprises of offsets as well as the estimation errors. Synchronization techniques consists of data aided and non-data aided. Data aided makes the use of additional data which consists of pilot and preamble. Non data aided make the use of correlation between the CP and the end of the Symbols. The correction of timing and frequency offset plays the significant role in OFDM system. Estimating the starting point of an OFDM system must be handled efficiently and effectively to reduce errors.