It's a little tricky because it's the same word! However, it has two different pronunciations and meanings:
* SEC-ond: Meaning "coming after the first" (like the second floor of a building or the second time you try something).
* SEH-kand: Meaning "one sixtieth of a minute" (like a measure of time).
Let me know if you'd like to see examples of how they are used in sentences!