An Intent is how you navigate from one Activity to another and optionally pass data along with it:

// In MainActivity
binding.viewProfileButton.setOnClickListener {
    val intent = Intent(this, ProfileActivity::class.java)
    intent.putExtra("USER_NAME", "Ada Lovelace")
    startActivity(intent)
}

// In ProfileActivity
class ProfileActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityProfileBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val userName = intent.getStringExtra("USER_NAME") ?: "Guest"
        binding.profileNameText.text = userName
    }
}

Note the ?: "Guest" — getStringExtra always returns a nullable String?, since the calling Activity might not have supplied that extra at all. Handling that possibility explicitly, rather than assuming the extra will always be there, avoids a very common source of crashes.

Every Activity you create must also be declared in AndroidManifest.xml:

<activity android:name=".ProfileActivity" />