Questions & Answers about Tato činnost je důležitá.
Tato means this.
It is the feminine singular nominative form of the Czech demonstrative ten / ta / to.
In this sentence, činnost is a feminine singular noun, so the demonstrative must match it:
- masculine: ten
- feminine: ta / tato
- neuter: to
So:
- tato činnost = this activity
The longer form tato is a more explicit form of ta. In many contexts, ta can mean that or simply the one, while tato clearly means this.