einleiten
to initiate
To begin something or make the start of something, often a process, event, or action.
Der Vorsitzende leitete die Sitzung mit einer kurzen Begrüßung ein.
The chairperson initiated the meeting with a brief greeting.

to initiate / introduce
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to initiate
To begin something or make the start of something, often a process, event, or action.
Der Vorsitzende leitete die Sitzung mit einer kurzen Begrüßung ein.
The chairperson initiated the meeting with a brief greeting.

'Einleiten' is a separable verb. The prefix 'ein-' goes to the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Die Polizei leitet sofort eine Untersuchung ein.
The police immediately initiate an investigation.
The verb consists of the prefix 'ein-' (in/into) and the verb 'leiten' (to guide/lead). The literal meaning is therefore 'to guide into', which describes the start of a process or the bringing of something into something.
Mit diesem Satz leiten Sie den Hauptteil Ihres Aufsatzes ein.
With this sentence, you introduce the main part of your essay.
In formal contexts, 'einleiten' is often used for the beginning of official processes: 'ein Verfahren einleiten' (to initiate proceedings), 'Ermittlungen einleiten' (to initiate investigations), or 'rechtliche Schritte einleiten' (to initiate legal steps).
Die Staatsanwaltschaft hat ein Ermittlungsverfahren eingeleitet.
The public prosecutor's office has initiated an investigation.
In connection with words like 'Fluss' (river), 'Meer' (sea), 'Abwasser' (wastewater), or 'Chemikalien' (chemicals), 'einleiten' means that a substance is brought into a system. This use often has a negative connotation.
Es ist streng verboten, Giftstoffe in das Grundwasser einzuleiten.
It is strictly forbidden to discharge toxic substances into the groundwater.
When beginning a text or speech, the preposition 'mit' (with) is often used to name the means or the first words: 'etwas mit etwas einleiten' (to introduce something with something).
Die Kanzlerin leitete ihre Rede mit einem Dank an die Helfer ein.
The chancellor introduced her speech with thanks to the helpers.
to begin
'beginnen' and 'einleiten' can both express that something is starting. 'beginnen' is more general and fits many situations: a course begins, someone begins work, or a conversation begins. 'einleiten' sounds more formal and often emphasizes that someone deliberately prepares or triggers the start. It fits especially well with processes, measures, events, or with texts and speeches. In everyday language, people usually say 'beginnen'; 'einleiten' sounds more precise when the beginning is part of a plan or an official action.

Die Lehrerin leitet die Diskussion mit einer kurzen Frage ein.
The teacher introduces the discussion with a short question.
Nach der kurzen Pause beginnt Lea mit der Reparatur des Geräts.
After the short break, Lea begins repairing the device.