What is the meaning of "interrupts are disabled"?

Interrupts are disabled when using atomic sections:

atomic {

...

}

On the MSP430 micro controller, does this mean the interrupts will be
delayed after the atomic section, or simply be discarded?

The same question for maskable interrupts: while a maskable interrupt
handler is under execution, a new maskable interrupt comes - in this
case, this new interrupt will be "disabled". Does this mean the new
interrupt be discarded or delayed?

In what case will an interrupt be lost?

Thanks a lot!
Min
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