What is the Significance of Isospin Components in Particle Physics?

[smartypants123]

Over lots of studying on particle physics, i came across all kinds of different types of spins, like isospin, spin, weak isospin, and i even learned that there are 3 components for each isospin. Can someone tell me why we need these things and what is special about each component of weak isospin and isospin?

 

[smartypants123]

Update: I just found out that isospin has some relation to 'strong interaction' (but i still don't know what isospin is) so maybe in your reply you could sort of explain that

 

[smartypants123]

?

 

[vanhees71]

Have a look at Wikipedia, which explains isospin in quite some detail:

https://en.wikipedia.org/wiki/Isospin