Texas is an open primary state. Here’s what that means for how Republicans, Democrats and others can vote on Super Tuesday.

Unlike voters in most other states, Texans don’t sign up with a political party when they register to vote.

That’s because Texas is one of 17 states with open primaries, which means regardless of which party voters identify with, they can choose from year to year which party’s nominees they’d like to select in the primary election.

How do you choose?

When you show up to your polling location, you’ll decide whether you want a Democratic or Republican primary ballot.

But after choosing a side in the primary, you have to stay in that lane through the runoff. You can’t vote Republican in the primary election and then participate in a runoff election between top Democratic candidates.

That said, voting in a primary does not commit you to vote for a particular candidate in the general election. You can vote for either party’s candidate in the November election.

So how does that compare?

Voters who live in states with closed primaries are required to register with a political party in order to vote in that party’s primary. If you wanted to vote in the Republican primary in New York, you have to register as a Republican. Oftentimes, third-party voters are locked out of the Republican and Democratic primaries. But some states, like Oklahoma, are a bit of a hybrid and let independent voters choose which primaries they want to participate in.

Is it common for Democrats to participate in the Republican primary, and vice versa?

In short, no. According to Elizabeth Simas, a political science professor at the University of Houston who spoke about this with Texas Standard, cases of strategic voting don’t happen much in primary elections. “Certainly, there are people who do it … but we just don’t see it happening as much as there’s potentially this fear for it to happen,” Simas said.

In areas dominated by one party, especially rural areas, voters might cross party lines in the primary to have more of a say in their local races.

“In my county, all the local races are Republican. Judges, sheriff, district attorney,” Martha Mims, a Democratic voter who lives Williamson County, wrote in The Texas Tribune’s Facebook group, This is Your Texas. “If I want to have a say in local government, I have to vote in the Republican primary.”

Voters like Mims can do that, thanks to Texas’ open primary. Do you have more questions about voting in Texas? Submit them to our Texplainer series.

Disclosure: The University of Houston has been a financial supporter of The Texas Tribune, a nonprofit, nonpartisan news organization that is funded in part by donations from members, foundations and corporate sponsors. Financial supporters play no role in the Tribune’s journalism. Find a complete list of them here.