History and evidence

There are only a few surviving documents in Gothic, not enough to completely reconstruct the language.
The largest body of surviving documentation consists of codices written and commissioned by the Arian bishop Ulfilas (also known as Wulfila, 311-382), who was the leader of a community of Visigothic Christians in the Roman province of Moesia (modern Bulgaria/Romania). He commissioned a translation of the Greek Bible into the Gothic language, of which roughly three-quarters of the New Testament and some fragments of the Old Testament have survived.
Codex Argenteus (and the Speyer fragment): 188 leaves.
The best preserved Gothic manuscript, the Codex Argenteus, dates from the 6th century and was preserved and transmitted by northern Ostrogoths in modern Italy. It contains a large part of the four Gospels. Since it is a translation from Greek, the language of the Codex Argenteus is replete with borrowed Greek words and Greek usages. The syntax in particular is often copied directly from the Greek.
Codex Ambrosianus (Milan) (and the Codex Taurinensis): Five parts, totaling 193 leaves.
The Codex Ambrosianus contains scattered passages from the New Testament (including parts of the Gospels and the Epistles), of the Old Testament (Nehemiah), and some commentaries known as Skeireins. It is therefore likely that the text had been somewhat modified by copyists.
Codex Rehdigerianus from Uppsala universitetsbibliotek
Codex Gissensis (Gießen): 1 leaf, fragments of Luke 23-24. It was found in Egypt in 1907, but destroyed by water damage in 1945.
Codex Carolinus: (Wolfenbüttel): 4 leaves, fragments of Romans 11-15.
Codex Vaticanus Latinus 5750: 3 leaves, pages 57/58, 59/60 and 61/62 of the Skeireins.
A scattering of old documents: alphabets, calendars, glosses found in a number of manuscripts and a few runic inscriptions (between 3 and 13) that are known to be or suspected to be Gothic. Some scholars believe that these inscriptions are not at all Gothic (see Braune/Ebbinghaus "Gotische Grammatik" Tübingen 1981)
A small dictionary of more than eighty words, and a song without translation, compiled by the Fleming Ogier Ghiselin de Busbecq, the Habsburg ambassador to the court of the Ottoman Empire in Istanbul from 1555 to 1562, who was curious to find out about the language and by arrangement met two speakers of Crimean Gothic and listed the terms in his compilation Turkish Letters. These terms are from nearly a millennium later and are therefore not representative of the language of Ulfilas. See Crimean Gothic.

There have been unsubstantiated reports of the discovery of other parts of Ulfilas' bible. Heinrich May in 1968 claimed to have found in England 12 leaves of a palimpsest containing parts of the Gospel of Matthew. The claim was never substantiated.

Only fragments of the Gothic translation of the Bible have been preserved. The translation was apparently done in the Balkans region by people in close contact with Greek Christian culture. It appears that the Gothic Bible was used by the Visigoths in Iberia until circa 700 AD, and perhaps for a time in Italy, the Balkans and what is now Ukraine. In exterminating Arianism, many texts in Gothic were probably expunged and overwritten as palimpsests, or collected and burned. Apart from Biblical texts, the only substantial Gothic document which still exists, and the only lengthy text known to have been composed originally in the Gothic language, is the "Skeireins", a few pages of commentary on the Gospel of John.

There are very few references to the Gothic language in secondary sources after about 800. In De incrementis ecclesiae Christianae (840/2), Walafrid Strabo, who lived in Swabia, speaks of a group of monks, who reported that "even now certain peoples in Scythia (Dobrudja), especially around Tomis" spoke a sermo Theotiscus (Germanic language), which was the language of the Gothic translation of the Bible, and used such a liturgy.[1] He also refers to the use of Ulfilas' bible in a region probably around Lake Constance[citation needed]. In the former case, the language spoken by the monks was probably an incipient Crimean Gothic.

In evaluating medieval texts that mention the Goths, it must be noted that many writers used the word Goths to mean any Germanic people in eastern Europe (such as the Varangians), many of whom certainly did not use the Gothic language as known from the Gothic Bible. Some writers even referred to some Slavic-speaking people,like Croats, as Goths.

The relationship between the language of the Crimean Goths and Ulfilas' Gothic is less clear. The few fragments of their language from the 16th century show significant differences from the language of the Gothic Bible, although some of the glosses, such as ada for "egg", imply a common heritage, and Gothic mena ("moon"), compared to Crimean Gothic mine, clearly indicates that Crimean Gothic was East Germanic.

Generally, the Gothic language refers to the language of Ulfilas, but the attestations themselves are largely from the 6th century - long after Ulfilas had died. The above list is not exhaustive, and a more extensive list is available on the website of the Wulfila Project.
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Alphabet
Main article: Gothic alphabet

Ulfilas' Gothic, as well as that of the Skeireins and various other manuscripts, was written using an alphabet that was most likely invented by Ulfilas himself for his translation. Some scholars (e.g. Braune) claim that it was derived from the Greek alphabet only, while others maintain that there are some Gothic letters of Runic or Latin origin.

This Gothic alphabet has nothing to do with Blackletter (also called Gothic script), which was used to write the Roman alphabet from the 12th to 14th centuries and evolved into the Fraktur writing later used to write German.
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Sounds

It is possible to determine more or less exactly how the Gothic of Ulfilas was pronounced, primarily through comparative phonetic reconstruction. Furthermore, because Ulfilas tried to follow the original Greek text as much as possible in his translation, we know that he used the same writing conventions as those of contemporary Greek. Since the Greek of that period is well documented, it is possible to reconstruct much of Gothic pronunciation from translated texts. In addition, the way in which non-Greek names are transcribed in the Greek Bible and in Ulfilas' Bible is very informative.