Golden Crossover:

A “golden crossover” is a technical analysis buy signal that, in finance markets, happens when a short-term moving average crosses over a long-term moving average. The most frequent example is when the 50-day simple moving average (SMA) crosses over the 200-day SMA, indicating a possible reversal of a bearish to a bullish trend.
Explanation:
Moving Averages:
Moving averages smooth out price data over a given time period and assist in ascertaining trends. A shorter-term moving average (such as the 50-day) responds faster to changes in prices compared to a longer-term one (such as the 200-day).
Crossover:
When the shorter-term moving average crosses above the longer-term moving average, it signals that short-term price momentum is accelerating compared to the longer-term trend.
Bullish Signal:
This crossover is usually considered a bullish indicator and may indicate that prices could continue to rise.
Golden Cross:
The “golden cross” specifically denotes when the 50-day SMA crosses over the 200-day SMA.
Example:
When a stock’s 50-day SMA is $50 and the 200-day SMA is $48, and then the 50-day SMA increases above $48, crossing over the 200-day SMA, a golden cross is created.