How do enzymes speed up reactions ?

Enzymes are basically biocatalysts which increase the rate of reaction exponentially. For Each chemical reaction to occur , it must reach to an stage where both substrates are able to interact with eachbother so effeciently that some breaking or joining of bonds occur between them . This stage is called TRANSITION STAGE of reaction and energy at this stage is called transition state energy. In order to reach this stage , we must provide energy to substrates for their interaction .

Any reaction with less transition state energy occur easily as compare to the one with more transition state energy. Enzymes increase the rate of reaction by lowering the energy of transition state.