This is the 15228th most frequent Russian word.
попытаются
"(They) will try (to)."
In this sentence, 'попытаются' indicates an attempt or effort to do something. It's a verb in the future tense, third person plural.
Они попытаются сделать всё возможное, чтобы помочь.
They will try their best to help.
Here, 'попытаются' is used to express hypothetically making an attempt in the future tense.
Если они попытаются, то смогут добиться успеха.
If they try, they will be able to achieve success.
In this example, 'попытаются' refers to the possibility of attempting to change their opinion, future tense, third person plural.