dich
you
Second-person singular personal pronoun in the accusative. It is the informal form of address and refers to the person being addressed as the direct object.
Ich rufe dich später an.
I'll call you later.

you
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you
Second-person singular personal pronoun in the accusative. It is the informal form of address and refers to the person being addressed as the direct object.
Ich rufe dich später an.
I'll call you later.

When the subject is 'du' (you), 'dich' (you/yourself) is used for reflexive verbs. So the action refers back to the person being addressed. Examples are 'sich fühlen' (to feel), 'sich setzen' (to sit down), 'sich interessieren für' (to be interested in).
Du solltest dich mehr ausruhen.
You should rest more.
'Dich' (you) is the accusative form of 'du' (you) and is used as a direct object (answering 'Wen oder was?' — whom or what?). It is used with verbs like 'lieben' (to love), 'hassen' (to hate), 'besuchen' (to visit), or 'fragen' (to ask).
Ich habe dich gestern in der Stadt gesehen.
I saw you in town yesterday.
After prepositions that require the accusative, the form 'dich' (you) is used when addressing a person with 'du' (you). Typical prepositions for this are 'für' (for), 'ohne' (without), and 'gegen' (against).
Ich habe hier ein kleines Paket für dich.
I have a small package here for you.
you
'du' and 'dich' both refer to a single person you address informally. The difference is their role in the sentence. You use 'du' as the subject, meaning the person who does something or is something. You use 'dich' as the direct object, meaning the person affected by an action. Learners often confuse them because both belong to the informal 'you' form. Simply ask: Who is doing something? Then use 'du'. Who is affected by it? Then use 'dich'.

Ich rufe dich nach der Arbeit an.
I'll call you after work.
Du wartest vor dem Termin in der Küche.
You are waiting in the kitchen before the appointment.