By dividing up the total amount to be invested across periodic purchases of a target asset in an effort you may be able to reduce the impact of volatility on the overall purchase. Dollar-cost averaging can help reduce risk and preserve capital to avoid a market crash. It will provide liquidity and flexibility in managing an investment portfolio.
However, a disadvantage is that the market tends to go up over time. So, choosing this strategy might also depend on how long you are interested in investing for and if you will need access to your fund in the near future. Talk to your adviser to figure out what is best for you.
Find more about this on Investopedia