Answer:
kill 1010 command is used to terminate the process 1010 using the TERM signal that is a default signal because user didn't specified any signal here.
kill -15 1010 command is used to terminate the process 1010 using the signal SIGTERM. Here the user has specified the signal that is using the numbers that is 15 that stands for SIGTERM signal.
Step-by-step explanation:
kill command is used in Linux or unix based systems to terminate a process manually.kill commands use to send a signal to the process which terminates the process.Here the signal is specified by number 15 that stands for SIGTERM signal.