einladen
to invite
To ask someone to be a guest, for example at a celebration, a meal, or a visit.
Wir möchten euch herzlich zu unserer Hochzeit einladen.
We would like to warmly invite you to our wedding.

to invite / load
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to invite
To ask someone to be a guest, for example at a celebration, a meal, or a visit.
Wir möchten euch herzlich zu unserer Hochzeit einladen.
We would like to warmly invite you to our wedding.

'Einladen' (to invite / load) is a separable verb. The prefix 'ein-' goes at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Er lädt seine Freunde zum Geburtstag ein.
He invites his friends to his birthday.
The verb consists of the prefix 'ein-' and the verb 'laden' (to load). The literal meaning 'hineinladen' (to load into, e.g. boxes into a car) is still a main meaning of the word and helps in understanding the figurative meanings.
Hilfst du mir, die Einkäufe ins Auto einzuladen?
Will you help me load the groceries into the car?
The meaning of 'einladen' depends strongly on the object. If you invite a person, it usually means 'to ask them as a guest'. If you load a thing, it means 'to load it into a vehicle'.
Sie hat ihre Nachbarn zum Grillen eingeladen.
She invited her neighbors for a barbecue.
When you invite someone to an event or a meal, you use the preposition 'zu' (+ dative). With drinks or snacks, 'auf' (+ accusative) is also very common.
Ich lade dich herzlich zu meiner Feier ein.
I warmly invite you to my party.
The expression 'zu etwas einladen' can also be used figuratively. It then means that a situation encourages or practically provokes something, usually something negative.
Das unklare Schild am Eingang lädt zu Missverständnissen ein.
The unclear sign at the entrance invites misunderstandings.
to pay
'bezahlen' and 'einladen' can both have to do with money. 'bezahlen' generally means to give money for something, for example for food, a bill, or a service. 'einladen' means, in this context, that you pay for another person. The words can be confused because in both cases someone gives money in the end. The important difference is: if you pay only your own bill, you 'bezahlen'. If you cover the costs for someone else, you 'lädst diese Person ein' (treat that person).

Zum Geburtstag lädt mich mein Vater ins Restaurant ein.
For my birthday, my father treats me to a meal at a restaurant.
An der Kasse bezahlt Lisa die Lebensmittel mit Karte.
At the checkout, Lisa pays for the groceries by card.