Can you give me some tips in replacing a 3 way electrical light switch?

I have to replace an old vintage 3 way light switch in the house because it broke.Can i just replace the one switch with an new one,or do i have to replace both switches that run the same light? The reason i ask is that i thought i read somewhere that you have to replace both switches at once but i didnt know... show more I have to replace an old vintage 3 way light switch in the house because it broke.Can i just replace the one switch with an new one,or do i have to replace both switches that run the same light?

The reason i ask is that i thought i read somewhere that you have to replace both switches at once but i didnt know why?Any help?
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