What is the difference between indeterminate and determinate sentencing in law?

Indeterminate sentencing allows for a range of possible release dates, determined by a parole board based on the individual's behavior while in prison. Determinate sentencing mandates a fixed term of imprisonment without the possibility of parole or early release. Determinate sentencing provides more certainty in terms of the length of incarceration, while indeterminate sentencing allows for flexibility based on the inmate's conduct.