Palm oil refers to the index, which is formed by weighting the trading volume of relevant trading platforms according to the listed contracts and weighting the average price and trading volume of the contracts from 1207 to 1306 in your figure. This has different names in different market platforms, also called continuous contracts.

Palm oil main force: the main futures contract will change, but its trend is different from that of stocks for a long time. In order to analyze the long-term changes, the trading platform will link the main contracts according to the maximum trading volume in a certain period of time. For example, the main contract in your picture was 1209 contract before, and now it will gradually move towards 130 1 contract, and the next one is 1305 contract. And the current main contract is 130 1. If you click on the palm oil main force, the trend will show 130 1 contract, and in a few months, it will show 1305 contract.

Palm oil can't be bought or sold. You can only buy and sell exact contracts such as 130 1 contract.

What is continuous and what is simulation is a kind of contract processing of trading platform, which cannot be bought or sold.