Nirvāṇa marks the end of Saṃsāra, the latter term translatable with adequate accuracy as a ‘Disoriented Search’.
But Nirvāṇa is defined only in relationship to what it is not. My Search ends when I no longer find myself searching.
‘There is not a whit of difference between Nirvāṇa and Saṃsāra’, the Scholar-Monk Nāgārjuna [100 C.E.] famously declared.
And in case you find that ambiguous or unconvincing, he adds: ‘And there is not a whit of difference between Saṃsāra and Nirvāṇa’.
It is markedly unwise, dangerously facile, to explain the nature of ‘World’ to one who can interpret the explanation only from the platform of a presumed observing and separated ‘Self’. [In other words, don’t write Sites like this one.]
In the common analogy, it’s like explaining life outside water to a fish that has known nothing else and cannot conceive it with any credence.
The fish is an easier case. With us humans, explanation is both unconvincing and deleterious.
It’s sort of like the situation at the counter at the Rolls-Royce dealership. If you need to ask the price you probably can’t afford it.
If you need to have Nirvāṇa explained, you won’t understand it.