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Asking about what bitcoin halving is what one can easily get an answer to either on google or from the forum search engine, but your second question is what i have an answer to, bitcoin will always increases in value after every successful halving every four years, there will be an increase in bitcoin value otherwise known as bullrun while the Bitcoin mining reward is reduced by 50% it corresponding value increases and forms a new all time high, this has been in place ever since the beginning and occurs every four years interval.
Since we are here in the Beginners section of the forum I would not like to leave this statement as it is, otherwise, newcomers could read this and accept it as a God-given law.
Until now it was actually like this that each Halving has also initiated the bullrun that took place about 6 to 12 months later. However, one cannot and must not conclude from the past to the future, i.e. it may well be that this is already no longer the case in for the Halving-event in 2024 ... or in one of the later following Halvings - and yes, I know that there is some evidence here in terms of market economics why Halvings trigger the bullrun, but I would still never rely on this.
Until now, it was also considered an iron rule that a low of a subsequent cycle never falls below the all-time high of the last cycle. This rule was also broken in this cycle when BTC was below 16k in November last year.
So: Just because one event followed another several times in the past (Halving -> Bullrun) doesn't mean that it will happen again in the future ... and this should certainly not be a reason for an investment decision.