Community property is all the property acquired during the marriage, no matter whose name it is in. Even property acquired in another state during marriage is community.
In Texas, the income from separate property is also considered community property although the appreciation in value of the underlying assets remains separate.
The presumption in Texas is that everything is community property unless proven otherwise.
Some assets are partially separate and partially community. For instance, if dividends on your separate property are reinvested, then over time, the account becomes more and more community. This requires tracing to unravel.