uralt
ancient
Extremely old, dating from a very long time ago. It is used to strongly emphasize great age.
In der Burg fanden sie ein uraltes Manuskript.
In the castle, they found an ancient manuscript.

ancient / outdated
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ancient
Extremely old, dating from a very long time ago. It is used to strongly emphasize great age.
In der Burg fanden sie ein uraltes Manuskript.
In the castle, they found an ancient manuscript.

The prefix 'ur-' intensifies the adjective 'alt' (old). It means 'very', 'extremely', or 'original'. So 'uralt' (ancient/very old) is much stronger than just 'alt' (old).
Dieser Baum im Garten ist schon uralt.
This tree in the garden is already ancient.
The noun that 'uralt' describes reveals the meaning. An 'uraltes Schloss' (ancient castle) is historically old, while an 'uraltes Handy' (outdated phone) is old-fashioned and obsolete.
Wir besichtigten eine uralte Ruine.
We visited an ancient ruin.
The meaning 'outdated' or 'old-fashioned' is mainly used in colloquial language, especially when talking about technology, fashion, or jokes.
Seine Methoden sind ja uralt, das macht heute niemand mehr so.
His methods are really outdated; nobody does it that way anymore.
new
'neu' and 'uralt' are clear opposites. 'neu' describes something that was created or bought only recently, or that shows a change. 'uralt' strongly emphasizes that something is extremely old. Colloquially, 'uralt' can also mean that something is completely outdated or no longer modern. 'neu' sounds neutral, while 'uralt' is often stronger and sometimes judgmental.

Im Kurs benutzt der Gast noch einen uralten Laptop.
In the course, the guest is still using an ancient laptop.
Die Mitarbeiterin testet die neue App auf ihrem Handy.
The employee is testing the new app on her phone.