SIP stands for Systematic Investment Plan.
If you set up an SIP in a mutual fund, a fixed amount (decided by you) gets invested in a mutual fund of your choice every month.
You can cancel an SIP any time.
SWP stands for Systematic Withdrawal Plan. Like in the case of an SIP, you can set the amount you want to withdraw every month from a mutual fund you have chosen.
SWP is a good way to take out money from a mutual fund over a period of time instead of in one go.
It averages out the returns and prevents single day market ups and downs from affecting your returns.