I am having problems importing data what does collation mean?

The reason I ask is I keep getting an error importing data.. So I am looking at my wp-config file and the collation reads as follows.

```
/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8mb4');

/** The Database Collate type. Don't change this if in doubt. */
define('DB_COLLATE', '');

```

So I go over to phpMyAdmin and the Server charset is UTF-8 Unicode (utf8) I don't know if this has any meaning but in the server connection collation box it reads `utf8mb4_unicode_ci`. 

Here's where I think the problem lies but I am a total newbie with mySQL. My main wordpress database has collation type `latin1_swedish_ci` next to it - under collation.

When I click into the database they all have utf8 charsets different ones some `utf8mb4_unicode_ci` and some `utf8_general_ci` - does this mean the database is set up incorrectly?

Could this be the cause of my import problems and how do I fix it.