Here is some references from google and wikipedia, and i do think searching from there is more easy than asking in the forums.
bub·ble
ˈbəb(ə)l/Submit
2.
used to refer to a good or fortunate situation that is isolated from reality or unlikely to last.
"we both lived in a bubble, the kind provided by occupying a privileged pied-à-terre in Greenwich Village"
https://en.wikipedia.org/wiki/Economic_bubble
An economic bubble or asset bubble (sometimes also referred to as a speculative bubble, a market bubble, a price bubble, a financial bubble, a speculative mania, or a balloon) is trade in an asset at a price or price range that strongly exceeds the asset's intrinsic value.
So basically a bubble is where an assets was traded in a price of range which many economist think that it is overvalued and will burst one day causing collapes to the economic system, there are lots of economics bubble sample as you will see in the wikipedia list such as tulips bubble, housing bubble and stocks bubble and recently bitcoin also added as a bubble mostly because of the volatility
bub·ble
ˈbəb(ə)l/Submit
2.
used to refer to a good or fortunate situation that is isolated from reality or unlikely to last.
"we both lived in a bubble, the kind provided by occupying a privileged pied-à-terre in Greenwich Village"
https://en.wikipedia.org/wiki/Economic_bubble
An economic bubble or asset bubble (sometimes also referred to as a speculative bubble, a market bubble, a price bubble, a financial bubble, a speculative mania, or a balloon) is trade in an asset at a price or price range that strongly exceeds the asset's intrinsic value.
So basically a bubble is where an assets was traded in a price of range which many economist think that it is overvalued and will burst one day causing collapes to the economic system, there are lots of economics bubble sample as you will see in the wikipedia list such as tulips bubble, housing bubble and stocks bubble and recently bitcoin also added as a bubble mostly because of the volatility