Final answer:
DATEDIFF and TIMEDIFF are SQL functions used to calculate the difference between two dates or times respectively; DATEDIFF returns the number of days, while TIMEDIFF returns the time difference in hours, minutes, and seconds.
Step-by-step explanation:
The functions DATEDIFF(expr1, expr2) and TIMEDIFF(expr1, expr2) are commonly used in SQL, which stands for Structured Query Language. SQL is used for managing and manipulating relational databases. The DATEDIFF function is used to find the difference between two dates, and it returns the number of days between expr1 and expr2. On the other hand, TIMEDIFF calculates the difference between two time expressions, returning the time expressed in hours, minutes, and seconds.
For example, if we had two dates, '2023-01-01' and '2023-01-10', DATEDIFF would return 9, indicating the difference of 9 days. Similarly, if expr1 is '10:00:00' and expr2 is '09:00:00', then TIMEDIFF would return '01:00:00', showing there is a difference of one hour between the two times.